| File: | tools/clang/lib/CodeGen/CGExprScalar.cpp |
| Warning: | line 4416, column 10 Although the value stored to 'Src' is used in the enclosing expression, the value is never actually read from 'Src' |
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| 1 | //===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===// |
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // This contains code to emit Expr nodes with scalar LLVM types as LLVM code. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "CGCXXABI.h" |
| 14 | #include "CGCleanup.h" |
| 15 | #include "CGDebugInfo.h" |
| 16 | #include "CGObjCRuntime.h" |
| 17 | #include "CodeGenFunction.h" |
| 18 | #include "CodeGenModule.h" |
| 19 | #include "ConstantEmitter.h" |
| 20 | #include "TargetInfo.h" |
| 21 | #include "clang/AST/ASTContext.h" |
| 22 | #include "clang/AST/DeclObjC.h" |
| 23 | #include "clang/AST/Expr.h" |
| 24 | #include "clang/AST/RecordLayout.h" |
| 25 | #include "clang/AST/StmtVisitor.h" |
| 26 | #include "clang/Basic/CodeGenOptions.h" |
| 27 | #include "clang/Basic/FixedPoint.h" |
| 28 | #include "clang/Basic/TargetInfo.h" |
| 29 | #include "llvm/ADT/Optional.h" |
| 30 | #include "llvm/IR/CFG.h" |
| 31 | #include "llvm/IR/Constants.h" |
| 32 | #include "llvm/IR/DataLayout.h" |
| 33 | #include "llvm/IR/Function.h" |
| 34 | #include "llvm/IR/GetElementPtrTypeIterator.h" |
| 35 | #include "llvm/IR/GlobalVariable.h" |
| 36 | #include "llvm/IR/Intrinsics.h" |
| 37 | #include "llvm/IR/Module.h" |
| 38 | #include <cstdarg> |
| 39 | |
| 40 | using namespace clang; |
| 41 | using namespace CodeGen; |
| 42 | using llvm::Value; |
| 43 | |
| 44 | //===----------------------------------------------------------------------===// |
| 45 | // Scalar Expression Emitter |
| 46 | //===----------------------------------------------------------------------===// |
| 47 | |
| 48 | namespace { |
| 49 | |
| 50 | /// Determine whether the given binary operation may overflow. |
| 51 | /// Sets \p Result to the value of the operation for BO_Add, BO_Sub, BO_Mul, |
| 52 | /// and signed BO_{Div,Rem}. For these opcodes, and for unsigned BO_{Div,Rem}, |
| 53 | /// the returned overflow check is precise. The returned value is 'true' for |
| 54 | /// all other opcodes, to be conservative. |
| 55 | bool mayHaveIntegerOverflow(llvm::ConstantInt *LHS, llvm::ConstantInt *RHS, |
| 56 | BinaryOperator::Opcode Opcode, bool Signed, |
| 57 | llvm::APInt &Result) { |
| 58 | // Assume overflow is possible, unless we can prove otherwise. |
| 59 | bool Overflow = true; |
| 60 | const auto &LHSAP = LHS->getValue(); |
| 61 | const auto &RHSAP = RHS->getValue(); |
| 62 | if (Opcode == BO_Add) { |
| 63 | if (Signed) |
| 64 | Result = LHSAP.sadd_ov(RHSAP, Overflow); |
| 65 | else |
| 66 | Result = LHSAP.uadd_ov(RHSAP, Overflow); |
| 67 | } else if (Opcode == BO_Sub) { |
| 68 | if (Signed) |
| 69 | Result = LHSAP.ssub_ov(RHSAP, Overflow); |
| 70 | else |
| 71 | Result = LHSAP.usub_ov(RHSAP, Overflow); |
| 72 | } else if (Opcode == BO_Mul) { |
| 73 | if (Signed) |
| 74 | Result = LHSAP.smul_ov(RHSAP, Overflow); |
| 75 | else |
| 76 | Result = LHSAP.umul_ov(RHSAP, Overflow); |
| 77 | } else if (Opcode == BO_Div || Opcode == BO_Rem) { |
| 78 | if (Signed && !RHS->isZero()) |
| 79 | Result = LHSAP.sdiv_ov(RHSAP, Overflow); |
| 80 | else |
| 81 | return false; |
| 82 | } |
| 83 | return Overflow; |
| 84 | } |
| 85 | |
| 86 | struct BinOpInfo { |
| 87 | Value *LHS; |
| 88 | Value *RHS; |
| 89 | QualType Ty; // Computation Type. |
| 90 | BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform |
| 91 | FPOptions FPFeatures; |
| 92 | const Expr *E; // Entire expr, for error unsupported. May not be binop. |
| 93 | |
| 94 | /// Check if the binop can result in integer overflow. |
| 95 | bool mayHaveIntegerOverflow() const { |
| 96 | // Without constant input, we can't rule out overflow. |
| 97 | auto *LHSCI = dyn_cast<llvm::ConstantInt>(LHS); |
| 98 | auto *RHSCI = dyn_cast<llvm::ConstantInt>(RHS); |
| 99 | if (!LHSCI || !RHSCI) |
| 100 | return true; |
| 101 | |
| 102 | llvm::APInt Result; |
| 103 | return ::mayHaveIntegerOverflow( |
| 104 | LHSCI, RHSCI, Opcode, Ty->hasSignedIntegerRepresentation(), Result); |
| 105 | } |
| 106 | |
| 107 | /// Check if the binop computes a division or a remainder. |
| 108 | bool isDivremOp() const { |
| 109 | return Opcode == BO_Div || Opcode == BO_Rem || Opcode == BO_DivAssign || |
| 110 | Opcode == BO_RemAssign; |
| 111 | } |
| 112 | |
| 113 | /// Check if the binop can result in an integer division by zero. |
| 114 | bool mayHaveIntegerDivisionByZero() const { |
| 115 | if (isDivremOp()) |
| 116 | if (auto *CI = dyn_cast<llvm::ConstantInt>(RHS)) |
| 117 | return CI->isZero(); |
| 118 | return true; |
| 119 | } |
| 120 | |
| 121 | /// Check if the binop can result in a float division by zero. |
| 122 | bool mayHaveFloatDivisionByZero() const { |
| 123 | if (isDivremOp()) |
| 124 | if (auto *CFP = dyn_cast<llvm::ConstantFP>(RHS)) |
| 125 | return CFP->isZero(); |
| 126 | return true; |
| 127 | } |
| 128 | |
| 129 | /// Check if either operand is a fixed point type or integer type, with at |
| 130 | /// least one being a fixed point type. In any case, this |
| 131 | /// operation did not follow usual arithmetic conversion and both operands may |
| 132 | /// not be the same. |
| 133 | bool isFixedPointBinOp() const { |
| 134 | // We cannot simply check the result type since comparison operations return |
| 135 | // an int. |
| 136 | if (const auto *BinOp = dyn_cast<BinaryOperator>(E)) { |
| 137 | QualType LHSType = BinOp->getLHS()->getType(); |
| 138 | QualType RHSType = BinOp->getRHS()->getType(); |
| 139 | return LHSType->isFixedPointType() || RHSType->isFixedPointType(); |
| 140 | } |
| 141 | return false; |
| 142 | } |
| 143 | }; |
| 144 | |
| 145 | static bool MustVisitNullValue(const Expr *E) { |
| 146 | // If a null pointer expression's type is the C++0x nullptr_t, then |
| 147 | // it's not necessarily a simple constant and it must be evaluated |
| 148 | // for its potential side effects. |
| 149 | return E->getType()->isNullPtrType(); |
| 150 | } |
| 151 | |
| 152 | /// If \p E is a widened promoted integer, get its base (unpromoted) type. |
| 153 | static llvm::Optional<QualType> getUnwidenedIntegerType(const ASTContext &Ctx, |
| 154 | const Expr *E) { |
| 155 | const Expr *Base = E->IgnoreImpCasts(); |
| 156 | if (E == Base) |
| 157 | return llvm::None; |
| 158 | |
| 159 | QualType BaseTy = Base->getType(); |
| 160 | if (!BaseTy->isPromotableIntegerType() || |
| 161 | Ctx.getTypeSize(BaseTy) >= Ctx.getTypeSize(E->getType())) |
| 162 | return llvm::None; |
| 163 | |
| 164 | return BaseTy; |
| 165 | } |
| 166 | |
| 167 | /// Check if \p E is a widened promoted integer. |
| 168 | static bool IsWidenedIntegerOp(const ASTContext &Ctx, const Expr *E) { |
| 169 | return getUnwidenedIntegerType(Ctx, E).hasValue(); |
| 170 | } |
| 171 | |
| 172 | /// Check if we can skip the overflow check for \p Op. |
| 173 | static bool CanElideOverflowCheck(const ASTContext &Ctx, const BinOpInfo &Op) { |
| 174 | assert((isa<UnaryOperator>(Op.E) || isa<BinaryOperator>(Op.E)) &&(((isa<UnaryOperator>(Op.E) || isa<BinaryOperator> (Op.E)) && "Expected a unary or binary operator") ? static_cast <void> (0) : __assert_fail ("(isa<UnaryOperator>(Op.E) || isa<BinaryOperator>(Op.E)) && \"Expected a unary or binary operator\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 175, __PRETTY_FUNCTION__)) |
| 175 | "Expected a unary or binary operator")(((isa<UnaryOperator>(Op.E) || isa<BinaryOperator> (Op.E)) && "Expected a unary or binary operator") ? static_cast <void> (0) : __assert_fail ("(isa<UnaryOperator>(Op.E) || isa<BinaryOperator>(Op.E)) && \"Expected a unary or binary operator\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 175, __PRETTY_FUNCTION__)); |
| 176 | |
| 177 | // If the binop has constant inputs and we can prove there is no overflow, |
| 178 | // we can elide the overflow check. |
| 179 | if (!Op.mayHaveIntegerOverflow()) |
| 180 | return true; |
| 181 | |
| 182 | // If a unary op has a widened operand, the op cannot overflow. |
| 183 | if (const auto *UO = dyn_cast<UnaryOperator>(Op.E)) |
| 184 | return !UO->canOverflow(); |
| 185 | |
| 186 | // We usually don't need overflow checks for binops with widened operands. |
| 187 | // Multiplication with promoted unsigned operands is a special case. |
| 188 | const auto *BO = cast<BinaryOperator>(Op.E); |
| 189 | auto OptionalLHSTy = getUnwidenedIntegerType(Ctx, BO->getLHS()); |
| 190 | if (!OptionalLHSTy) |
| 191 | return false; |
| 192 | |
| 193 | auto OptionalRHSTy = getUnwidenedIntegerType(Ctx, BO->getRHS()); |
| 194 | if (!OptionalRHSTy) |
| 195 | return false; |
| 196 | |
| 197 | QualType LHSTy = *OptionalLHSTy; |
| 198 | QualType RHSTy = *OptionalRHSTy; |
| 199 | |
| 200 | // This is the simple case: binops without unsigned multiplication, and with |
| 201 | // widened operands. No overflow check is needed here. |
| 202 | if ((Op.Opcode != BO_Mul && Op.Opcode != BO_MulAssign) || |
| 203 | !LHSTy->isUnsignedIntegerType() || !RHSTy->isUnsignedIntegerType()) |
| 204 | return true; |
| 205 | |
| 206 | // For unsigned multiplication the overflow check can be elided if either one |
| 207 | // of the unpromoted types are less than half the size of the promoted type. |
| 208 | unsigned PromotedSize = Ctx.getTypeSize(Op.E->getType()); |
| 209 | return (2 * Ctx.getTypeSize(LHSTy)) < PromotedSize || |
| 210 | (2 * Ctx.getTypeSize(RHSTy)) < PromotedSize; |
| 211 | } |
| 212 | |
| 213 | /// Update the FastMathFlags of LLVM IR from the FPOptions in LangOptions. |
| 214 | static void updateFastMathFlags(llvm::FastMathFlags &FMF, |
| 215 | FPOptions FPFeatures) { |
| 216 | FMF.setAllowContract(FPFeatures.allowFPContractAcrossStatement()); |
| 217 | } |
| 218 | |
| 219 | /// Propagate fast-math flags from \p Op to the instruction in \p V. |
| 220 | static Value *propagateFMFlags(Value *V, const BinOpInfo &Op) { |
| 221 | if (auto *I = dyn_cast<llvm::Instruction>(V)) { |
| 222 | llvm::FastMathFlags FMF = I->getFastMathFlags(); |
| 223 | updateFastMathFlags(FMF, Op.FPFeatures); |
| 224 | I->setFastMathFlags(FMF); |
| 225 | } |
| 226 | return V; |
| 227 | } |
| 228 | |
| 229 | class ScalarExprEmitter |
| 230 | : public StmtVisitor<ScalarExprEmitter, Value*> { |
| 231 | CodeGenFunction &CGF; |
| 232 | CGBuilderTy &Builder; |
| 233 | bool IgnoreResultAssign; |
| 234 | llvm::LLVMContext &VMContext; |
| 235 | public: |
| 236 | |
| 237 | ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false) |
| 238 | : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira), |
| 239 | VMContext(cgf.getLLVMContext()) { |
| 240 | } |
| 241 | |
| 242 | //===--------------------------------------------------------------------===// |
| 243 | // Utilities |
| 244 | //===--------------------------------------------------------------------===// |
| 245 | |
| 246 | bool TestAndClearIgnoreResultAssign() { |
| 247 | bool I = IgnoreResultAssign; |
| 248 | IgnoreResultAssign = false; |
| 249 | return I; |
| 250 | } |
| 251 | |
| 252 | llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); } |
| 253 | LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); } |
| 254 | LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) { |
| 255 | return CGF.EmitCheckedLValue(E, TCK); |
| 256 | } |
| 257 | |
| 258 | void EmitBinOpCheck(ArrayRef<std::pair<Value *, SanitizerMask>> Checks, |
| 259 | const BinOpInfo &Info); |
| 260 | |
| 261 | Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) { |
| 262 | return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal(); |
| 263 | } |
| 264 | |
| 265 | void EmitLValueAlignmentAssumption(const Expr *E, Value *V) { |
| 266 | const AlignValueAttr *AVAttr = nullptr; |
| 267 | if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) { |
| 268 | const ValueDecl *VD = DRE->getDecl(); |
| 269 | |
| 270 | if (VD->getType()->isReferenceType()) { |
| 271 | if (const auto *TTy = |
| 272 | dyn_cast<TypedefType>(VD->getType().getNonReferenceType())) |
| 273 | AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>(); |
| 274 | } else { |
| 275 | // Assumptions for function parameters are emitted at the start of the |
| 276 | // function, so there is no need to repeat that here, |
| 277 | // unless the alignment-assumption sanitizer is enabled, |
| 278 | // then we prefer the assumption over alignment attribute |
| 279 | // on IR function param. |
| 280 | if (isa<ParmVarDecl>(VD) && !CGF.SanOpts.has(SanitizerKind::Alignment)) |
| 281 | return; |
| 282 | |
| 283 | AVAttr = VD->getAttr<AlignValueAttr>(); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | if (!AVAttr) |
| 288 | if (const auto *TTy = |
| 289 | dyn_cast<TypedefType>(E->getType())) |
| 290 | AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>(); |
| 291 | |
| 292 | if (!AVAttr) |
| 293 | return; |
| 294 | |
| 295 | Value *AlignmentValue = CGF.EmitScalarExpr(AVAttr->getAlignment()); |
| 296 | llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(AlignmentValue); |
| 297 | CGF.EmitAlignmentAssumption(V, E, AVAttr->getLocation(), AlignmentCI); |
| 298 | } |
| 299 | |
| 300 | /// EmitLoadOfLValue - Given an expression with complex type that represents a |
| 301 | /// value l-value, this method emits the address of the l-value, then loads |
| 302 | /// and returns the result. |
| 303 | Value *EmitLoadOfLValue(const Expr *E) { |
| 304 | Value *V = EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load), |
| 305 | E->getExprLoc()); |
| 306 | |
| 307 | EmitLValueAlignmentAssumption(E, V); |
| 308 | return V; |
| 309 | } |
| 310 | |
| 311 | /// EmitConversionToBool - Convert the specified expression value to a |
| 312 | /// boolean (i1) truth value. This is equivalent to "Val != 0". |
| 313 | Value *EmitConversionToBool(Value *Src, QualType DstTy); |
| 314 | |
| 315 | /// Emit a check that a conversion from a floating-point type does not |
| 316 | /// overflow. |
| 317 | void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType, |
| 318 | Value *Src, QualType SrcType, QualType DstType, |
| 319 | llvm::Type *DstTy, SourceLocation Loc); |
| 320 | |
| 321 | /// Known implicit conversion check kinds. |
| 322 | /// Keep in sync with the enum of the same name in ubsan_handlers.h |
| 323 | enum ImplicitConversionCheckKind : unsigned char { |
| 324 | ICCK_IntegerTruncation = 0, // Legacy, was only used by clang 7. |
| 325 | ICCK_UnsignedIntegerTruncation = 1, |
| 326 | ICCK_SignedIntegerTruncation = 2, |
| 327 | ICCK_IntegerSignChange = 3, |
| 328 | ICCK_SignedIntegerTruncationOrSignChange = 4, |
| 329 | }; |
| 330 | |
| 331 | /// Emit a check that an [implicit] truncation of an integer does not |
| 332 | /// discard any bits. It is not UB, so we use the value after truncation. |
| 333 | void EmitIntegerTruncationCheck(Value *Src, QualType SrcType, Value *Dst, |
| 334 | QualType DstType, SourceLocation Loc); |
| 335 | |
| 336 | /// Emit a check that an [implicit] conversion of an integer does not change |
| 337 | /// the sign of the value. It is not UB, so we use the value after conversion. |
| 338 | /// NOTE: Src and Dst may be the exact same value! (point to the same thing) |
| 339 | void EmitIntegerSignChangeCheck(Value *Src, QualType SrcType, Value *Dst, |
| 340 | QualType DstType, SourceLocation Loc); |
| 341 | |
| 342 | /// Emit a conversion from the specified type to the specified destination |
| 343 | /// type, both of which are LLVM scalar types. |
| 344 | struct ScalarConversionOpts { |
| 345 | bool TreatBooleanAsSigned; |
| 346 | bool EmitImplicitIntegerTruncationChecks; |
| 347 | bool EmitImplicitIntegerSignChangeChecks; |
| 348 | |
| 349 | ScalarConversionOpts() |
| 350 | : TreatBooleanAsSigned(false), |
| 351 | EmitImplicitIntegerTruncationChecks(false), |
| 352 | EmitImplicitIntegerSignChangeChecks(false) {} |
| 353 | |
| 354 | ScalarConversionOpts(clang::SanitizerSet SanOpts) |
| 355 | : TreatBooleanAsSigned(false), |
| 356 | EmitImplicitIntegerTruncationChecks( |
| 357 | SanOpts.hasOneOf(SanitizerKind::ImplicitIntegerTruncation)), |
| 358 | EmitImplicitIntegerSignChangeChecks( |
| 359 | SanOpts.has(SanitizerKind::ImplicitIntegerSignChange)) {} |
| 360 | }; |
| 361 | Value * |
| 362 | EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy, |
| 363 | SourceLocation Loc, |
| 364 | ScalarConversionOpts Opts = ScalarConversionOpts()); |
| 365 | |
| 366 | /// Convert between either a fixed point and other fixed point or fixed point |
| 367 | /// and an integer. |
| 368 | Value *EmitFixedPointConversion(Value *Src, QualType SrcTy, QualType DstTy, |
| 369 | SourceLocation Loc); |
| 370 | Value *EmitFixedPointConversion(Value *Src, FixedPointSemantics &SrcFixedSema, |
| 371 | FixedPointSemantics &DstFixedSema, |
| 372 | SourceLocation Loc, |
| 373 | bool DstIsInteger = false); |
| 374 | |
| 375 | /// Emit a conversion from the specified complex type to the specified |
| 376 | /// destination type, where the destination type is an LLVM scalar type. |
| 377 | Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src, |
| 378 | QualType SrcTy, QualType DstTy, |
| 379 | SourceLocation Loc); |
| 380 | |
| 381 | /// EmitNullValue - Emit a value that corresponds to null for the given type. |
| 382 | Value *EmitNullValue(QualType Ty); |
| 383 | |
| 384 | /// EmitFloatToBoolConversion - Perform an FP to boolean conversion. |
| 385 | Value *EmitFloatToBoolConversion(Value *V) { |
| 386 | // Compare against 0.0 for fp scalars. |
| 387 | llvm::Value *Zero = llvm::Constant::getNullValue(V->getType()); |
| 388 | return Builder.CreateFCmpUNE(V, Zero, "tobool"); |
| 389 | } |
| 390 | |
| 391 | /// EmitPointerToBoolConversion - Perform a pointer to boolean conversion. |
| 392 | Value *EmitPointerToBoolConversion(Value *V, QualType QT) { |
| 393 | Value *Zero = CGF.CGM.getNullPointer(cast<llvm::PointerType>(V->getType()), QT); |
| 394 | |
| 395 | return Builder.CreateICmpNE(V, Zero, "tobool"); |
| 396 | } |
| 397 | |
| 398 | Value *EmitIntToBoolConversion(Value *V) { |
| 399 | // Because of the type rules of C, we often end up computing a |
| 400 | // logical value, then zero extending it to int, then wanting it |
| 401 | // as a logical value again. Optimize this common case. |
| 402 | if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) { |
| 403 | if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) { |
| 404 | Value *Result = ZI->getOperand(0); |
| 405 | // If there aren't any more uses, zap the instruction to save space. |
| 406 | // Note that there can be more uses, for example if this |
| 407 | // is the result of an assignment. |
| 408 | if (ZI->use_empty()) |
| 409 | ZI->eraseFromParent(); |
| 410 | return Result; |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | return Builder.CreateIsNotNull(V, "tobool"); |
| 415 | } |
| 416 | |
| 417 | //===--------------------------------------------------------------------===// |
| 418 | // Visitor Methods |
| 419 | //===--------------------------------------------------------------------===// |
| 420 | |
| 421 | Value *Visit(Expr *E) { |
| 422 | ApplyDebugLocation DL(CGF, E); |
| 423 | return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E); |
| 424 | } |
| 425 | |
| 426 | Value *VisitStmt(Stmt *S) { |
| 427 | S->dump(CGF.getContext().getSourceManager()); |
| 428 | llvm_unreachable("Stmt can't have complex result type!")::llvm::llvm_unreachable_internal("Stmt can't have complex result type!" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 428); |
| 429 | } |
| 430 | Value *VisitExpr(Expr *S); |
| 431 | |
| 432 | Value *VisitConstantExpr(ConstantExpr *E) { |
| 433 | return Visit(E->getSubExpr()); |
| 434 | } |
| 435 | Value *VisitParenExpr(ParenExpr *PE) { |
| 436 | return Visit(PE->getSubExpr()); |
| 437 | } |
| 438 | Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) { |
| 439 | return Visit(E->getReplacement()); |
| 440 | } |
| 441 | Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) { |
| 442 | return Visit(GE->getResultExpr()); |
| 443 | } |
| 444 | Value *VisitCoawaitExpr(CoawaitExpr *S) { |
| 445 | return CGF.EmitCoawaitExpr(*S).getScalarVal(); |
| 446 | } |
| 447 | Value *VisitCoyieldExpr(CoyieldExpr *S) { |
| 448 | return CGF.EmitCoyieldExpr(*S).getScalarVal(); |
| 449 | } |
| 450 | Value *VisitUnaryCoawait(const UnaryOperator *E) { |
| 451 | return Visit(E->getSubExpr()); |
| 452 | } |
| 453 | |
| 454 | // Leaves. |
| 455 | Value *VisitIntegerLiteral(const IntegerLiteral *E) { |
| 456 | return Builder.getInt(E->getValue()); |
| 457 | } |
| 458 | Value *VisitFixedPointLiteral(const FixedPointLiteral *E) { |
| 459 | return Builder.getInt(E->getValue()); |
| 460 | } |
| 461 | Value *VisitFloatingLiteral(const FloatingLiteral *E) { |
| 462 | return llvm::ConstantFP::get(VMContext, E->getValue()); |
| 463 | } |
| 464 | Value *VisitCharacterLiteral(const CharacterLiteral *E) { |
| 465 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); |
| 466 | } |
| 467 | Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) { |
| 468 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); |
| 469 | } |
| 470 | Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { |
| 471 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); |
| 472 | } |
| 473 | Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { |
| 474 | return EmitNullValue(E->getType()); |
| 475 | } |
| 476 | Value *VisitGNUNullExpr(const GNUNullExpr *E) { |
| 477 | return EmitNullValue(E->getType()); |
| 478 | } |
| 479 | Value *VisitOffsetOfExpr(OffsetOfExpr *E); |
| 480 | Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); |
| 481 | Value *VisitAddrLabelExpr(const AddrLabelExpr *E) { |
| 482 | llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel()); |
| 483 | return Builder.CreateBitCast(V, ConvertType(E->getType())); |
| 484 | } |
| 485 | |
| 486 | Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) { |
| 487 | return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength()); |
| 488 | } |
| 489 | |
| 490 | Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) { |
| 491 | return CGF.EmitPseudoObjectRValue(E).getScalarVal(); |
| 492 | } |
| 493 | |
| 494 | Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) { |
| 495 | if (E->isGLValue()) |
| 496 | return EmitLoadOfLValue(CGF.getOrCreateOpaqueLValueMapping(E), |
| 497 | E->getExprLoc()); |
| 498 | |
| 499 | // Otherwise, assume the mapping is the scalar directly. |
| 500 | return CGF.getOrCreateOpaqueRValueMapping(E).getScalarVal(); |
| 501 | } |
| 502 | |
| 503 | // l-values. |
| 504 | Value *VisitDeclRefExpr(DeclRefExpr *E) { |
| 505 | if (CodeGenFunction::ConstantEmission Constant = CGF.tryEmitAsConstant(E)) |
| 506 | return CGF.emitScalarConstant(Constant, E); |
| 507 | return EmitLoadOfLValue(E); |
| 508 | } |
| 509 | |
| 510 | Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) { |
| 511 | return CGF.EmitObjCSelectorExpr(E); |
| 512 | } |
| 513 | Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) { |
| 514 | return CGF.EmitObjCProtocolExpr(E); |
| 515 | } |
| 516 | Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { |
| 517 | return EmitLoadOfLValue(E); |
| 518 | } |
| 519 | Value *VisitObjCMessageExpr(ObjCMessageExpr *E) { |
| 520 | if (E->getMethodDecl() && |
| 521 | E->getMethodDecl()->getReturnType()->isReferenceType()) |
| 522 | return EmitLoadOfLValue(E); |
| 523 | return CGF.EmitObjCMessageExpr(E).getScalarVal(); |
| 524 | } |
| 525 | |
| 526 | Value *VisitObjCIsaExpr(ObjCIsaExpr *E) { |
| 527 | LValue LV = CGF.EmitObjCIsaExpr(E); |
| 528 | Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal(); |
| 529 | return V; |
| 530 | } |
| 531 | |
| 532 | Value *VisitObjCAvailabilityCheckExpr(ObjCAvailabilityCheckExpr *E) { |
| 533 | VersionTuple Version = E->getVersion(); |
| 534 | |
| 535 | // If we're checking for a platform older than our minimum deployment |
| 536 | // target, we can fold the check away. |
| 537 | if (Version <= CGF.CGM.getTarget().getPlatformMinVersion()) |
| 538 | return llvm::ConstantInt::get(Builder.getInt1Ty(), 1); |
| 539 | |
| 540 | Optional<unsigned> Min = Version.getMinor(), SMin = Version.getSubminor(); |
| 541 | llvm::Value *Args[] = { |
| 542 | llvm::ConstantInt::get(CGF.CGM.Int32Ty, Version.getMajor()), |
| 543 | llvm::ConstantInt::get(CGF.CGM.Int32Ty, Min ? *Min : 0), |
| 544 | llvm::ConstantInt::get(CGF.CGM.Int32Ty, SMin ? *SMin : 0), |
| 545 | }; |
| 546 | |
| 547 | return CGF.EmitBuiltinAvailable(Args); |
| 548 | } |
| 549 | |
| 550 | Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E); |
| 551 | Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E); |
| 552 | Value *VisitConvertVectorExpr(ConvertVectorExpr *E); |
| 553 | Value *VisitMemberExpr(MemberExpr *E); |
| 554 | Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); } |
| 555 | Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { |
| 556 | return EmitLoadOfLValue(E); |
| 557 | } |
| 558 | |
| 559 | Value *VisitInitListExpr(InitListExpr *E); |
| 560 | |
| 561 | Value *VisitArrayInitIndexExpr(ArrayInitIndexExpr *E) { |
| 562 | assert(CGF.getArrayInitIndex() &&((CGF.getArrayInitIndex() && "ArrayInitIndexExpr not inside an ArrayInitLoopExpr?" ) ? static_cast<void> (0) : __assert_fail ("CGF.getArrayInitIndex() && \"ArrayInitIndexExpr not inside an ArrayInitLoopExpr?\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 563, __PRETTY_FUNCTION__)) |
| 563 | "ArrayInitIndexExpr not inside an ArrayInitLoopExpr?")((CGF.getArrayInitIndex() && "ArrayInitIndexExpr not inside an ArrayInitLoopExpr?" ) ? static_cast<void> (0) : __assert_fail ("CGF.getArrayInitIndex() && \"ArrayInitIndexExpr not inside an ArrayInitLoopExpr?\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 563, __PRETTY_FUNCTION__)); |
| 564 | return CGF.getArrayInitIndex(); |
| 565 | } |
| 566 | |
| 567 | Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { |
| 568 | return EmitNullValue(E->getType()); |
| 569 | } |
| 570 | Value *VisitExplicitCastExpr(ExplicitCastExpr *E) { |
| 571 | CGF.CGM.EmitExplicitCastExprType(E, &CGF); |
| 572 | return VisitCastExpr(E); |
| 573 | } |
| 574 | Value *VisitCastExpr(CastExpr *E); |
| 575 | |
| 576 | Value *VisitCallExpr(const CallExpr *E) { |
| 577 | if (E->getCallReturnType(CGF.getContext())->isReferenceType()) |
| 578 | return EmitLoadOfLValue(E); |
| 579 | |
| 580 | Value *V = CGF.EmitCallExpr(E).getScalarVal(); |
| 581 | |
| 582 | EmitLValueAlignmentAssumption(E, V); |
| 583 | return V; |
| 584 | } |
| 585 | |
| 586 | Value *VisitStmtExpr(const StmtExpr *E); |
| 587 | |
| 588 | // Unary Operators. |
| 589 | Value *VisitUnaryPostDec(const UnaryOperator *E) { |
| 590 | LValue LV = EmitLValue(E->getSubExpr()); |
| 591 | return EmitScalarPrePostIncDec(E, LV, false, false); |
| 592 | } |
| 593 | Value *VisitUnaryPostInc(const UnaryOperator *E) { |
| 594 | LValue LV = EmitLValue(E->getSubExpr()); |
| 595 | return EmitScalarPrePostIncDec(E, LV, true, false); |
| 596 | } |
| 597 | Value *VisitUnaryPreDec(const UnaryOperator *E) { |
| 598 | LValue LV = EmitLValue(E->getSubExpr()); |
| 599 | return EmitScalarPrePostIncDec(E, LV, false, true); |
| 600 | } |
| 601 | Value *VisitUnaryPreInc(const UnaryOperator *E) { |
| 602 | LValue LV = EmitLValue(E->getSubExpr()); |
| 603 | return EmitScalarPrePostIncDec(E, LV, true, true); |
| 604 | } |
| 605 | |
| 606 | llvm::Value *EmitIncDecConsiderOverflowBehavior(const UnaryOperator *E, |
| 607 | llvm::Value *InVal, |
| 608 | bool IsInc); |
| 609 | |
| 610 | llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV, |
| 611 | bool isInc, bool isPre); |
| 612 | |
| 613 | |
| 614 | Value *VisitUnaryAddrOf(const UnaryOperator *E) { |
| 615 | if (isa<MemberPointerType>(E->getType())) // never sugared |
| 616 | return CGF.CGM.getMemberPointerConstant(E); |
| 617 | |
| 618 | return EmitLValue(E->getSubExpr()).getPointer(); |
| 619 | } |
| 620 | Value *VisitUnaryDeref(const UnaryOperator *E) { |
| 621 | if (E->getType()->isVoidType()) |
| 622 | return Visit(E->getSubExpr()); // the actual value should be unused |
| 623 | return EmitLoadOfLValue(E); |
| 624 | } |
| 625 | Value *VisitUnaryPlus(const UnaryOperator *E) { |
| 626 | // This differs from gcc, though, most likely due to a bug in gcc. |
| 627 | TestAndClearIgnoreResultAssign(); |
| 628 | return Visit(E->getSubExpr()); |
| 629 | } |
| 630 | Value *VisitUnaryMinus (const UnaryOperator *E); |
| 631 | Value *VisitUnaryNot (const UnaryOperator *E); |
| 632 | Value *VisitUnaryLNot (const UnaryOperator *E); |
| 633 | Value *VisitUnaryReal (const UnaryOperator *E); |
| 634 | Value *VisitUnaryImag (const UnaryOperator *E); |
| 635 | Value *VisitUnaryExtension(const UnaryOperator *E) { |
| 636 | return Visit(E->getSubExpr()); |
| 637 | } |
| 638 | |
| 639 | // C++ |
| 640 | Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) { |
| 641 | return EmitLoadOfLValue(E); |
| 642 | } |
| 643 | Value *VisitSourceLocExpr(SourceLocExpr *SLE) { |
| 644 | auto &Ctx = CGF.getContext(); |
| 645 | APValue Evaluated = |
| 646 | SLE->EvaluateInContext(Ctx, CGF.CurSourceLocExprScope.getDefaultExpr()); |
| 647 | return ConstantEmitter(CGF.CGM, &CGF) |
| 648 | .emitAbstract(SLE->getLocation(), Evaluated, SLE->getType()); |
| 649 | } |
| 650 | |
| 651 | Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { |
| 652 | CodeGenFunction::CXXDefaultArgExprScope Scope(CGF, DAE); |
| 653 | return Visit(DAE->getExpr()); |
| 654 | } |
| 655 | Value *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) { |
| 656 | CodeGenFunction::CXXDefaultInitExprScope Scope(CGF, DIE); |
| 657 | return Visit(DIE->getExpr()); |
| 658 | } |
| 659 | Value *VisitCXXThisExpr(CXXThisExpr *TE) { |
| 660 | return CGF.LoadCXXThis(); |
| 661 | } |
| 662 | |
| 663 | Value *VisitExprWithCleanups(ExprWithCleanups *E); |
| 664 | Value *VisitCXXNewExpr(const CXXNewExpr *E) { |
| 665 | return CGF.EmitCXXNewExpr(E); |
| 666 | } |
| 667 | Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) { |
| 668 | CGF.EmitCXXDeleteExpr(E); |
| 669 | return nullptr; |
| 670 | } |
| 671 | |
| 672 | Value *VisitTypeTraitExpr(const TypeTraitExpr *E) { |
| 673 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); |
| 674 | } |
| 675 | |
| 676 | Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { |
| 677 | return llvm::ConstantInt::get(Builder.getInt32Ty(), E->getValue()); |
| 678 | } |
| 679 | |
| 680 | Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { |
| 681 | return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue()); |
| 682 | } |
| 683 | |
| 684 | Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) { |
| 685 | // C++ [expr.pseudo]p1: |
| 686 | // The result shall only be used as the operand for the function call |
| 687 | // operator (), and the result of such a call has type void. The only |
| 688 | // effect is the evaluation of the postfix-expression before the dot or |
| 689 | // arrow. |
| 690 | CGF.EmitScalarExpr(E->getBase()); |
| 691 | return nullptr; |
| 692 | } |
| 693 | |
| 694 | Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { |
| 695 | return EmitNullValue(E->getType()); |
| 696 | } |
| 697 | |
| 698 | Value *VisitCXXThrowExpr(const CXXThrowExpr *E) { |
| 699 | CGF.EmitCXXThrowExpr(E); |
| 700 | return nullptr; |
| 701 | } |
| 702 | |
| 703 | Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { |
| 704 | return Builder.getInt1(E->getValue()); |
| 705 | } |
| 706 | |
| 707 | // Binary Operators. |
| 708 | Value *EmitMul(const BinOpInfo &Ops) { |
| 709 | if (Ops.Ty->isSignedIntegerOrEnumerationType()) { |
| 710 | switch (CGF.getLangOpts().getSignedOverflowBehavior()) { |
| 711 | case LangOptions::SOB_Defined: |
| 712 | return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul"); |
| 713 | case LangOptions::SOB_Undefined: |
| 714 | if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) |
| 715 | return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul"); |
| 716 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
| 717 | case LangOptions::SOB_Trapping: |
| 718 | if (CanElideOverflowCheck(CGF.getContext(), Ops)) |
| 719 | return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul"); |
| 720 | return EmitOverflowCheckedBinOp(Ops); |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | if (Ops.Ty->isUnsignedIntegerType() && |
| 725 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) && |
| 726 | !CanElideOverflowCheck(CGF.getContext(), Ops)) |
| 727 | return EmitOverflowCheckedBinOp(Ops); |
| 728 | |
| 729 | if (Ops.LHS->getType()->isFPOrFPVectorTy()) { |
| 730 | Value *V = Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul"); |
| 731 | return propagateFMFlags(V, Ops); |
| 732 | } |
| 733 | return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul"); |
| 734 | } |
| 735 | /// Create a binary op that checks for overflow. |
| 736 | /// Currently only supports +, - and *. |
| 737 | Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops); |
| 738 | |
| 739 | // Check for undefined division and modulus behaviors. |
| 740 | void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops, |
| 741 | llvm::Value *Zero,bool isDiv); |
| 742 | // Common helper for getting how wide LHS of shift is. |
| 743 | static Value *GetWidthMinusOneValue(Value* LHS,Value* RHS); |
| 744 | Value *EmitDiv(const BinOpInfo &Ops); |
| 745 | Value *EmitRem(const BinOpInfo &Ops); |
| 746 | Value *EmitAdd(const BinOpInfo &Ops); |
| 747 | Value *EmitSub(const BinOpInfo &Ops); |
| 748 | Value *EmitShl(const BinOpInfo &Ops); |
| 749 | Value *EmitShr(const BinOpInfo &Ops); |
| 750 | Value *EmitAnd(const BinOpInfo &Ops) { |
| 751 | return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and"); |
| 752 | } |
| 753 | Value *EmitXor(const BinOpInfo &Ops) { |
| 754 | return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor"); |
| 755 | } |
| 756 | Value *EmitOr (const BinOpInfo &Ops) { |
| 757 | return Builder.CreateOr(Ops.LHS, Ops.RHS, "or"); |
| 758 | } |
| 759 | |
| 760 | // Helper functions for fixed point binary operations. |
| 761 | Value *EmitFixedPointBinOp(const BinOpInfo &Ops); |
| 762 | |
| 763 | BinOpInfo EmitBinOps(const BinaryOperator *E); |
| 764 | LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E, |
| 765 | Value *(ScalarExprEmitter::*F)(const BinOpInfo &), |
| 766 | Value *&Result); |
| 767 | |
| 768 | Value *EmitCompoundAssign(const CompoundAssignOperator *E, |
| 769 | Value *(ScalarExprEmitter::*F)(const BinOpInfo &)); |
| 770 | |
| 771 | // Binary operators and binary compound assignment operators. |
| 772 | #define HANDLEBINOP(OP) \ |
| 773 | Value *VisitBin ## OP(const BinaryOperator *E) { \ |
| 774 | return Emit ## OP(EmitBinOps(E)); \ |
| 775 | } \ |
| 776 | Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \ |
| 777 | return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \ |
| 778 | } |
| 779 | HANDLEBINOP(Mul) |
| 780 | HANDLEBINOP(Div) |
| 781 | HANDLEBINOP(Rem) |
| 782 | HANDLEBINOP(Add) |
| 783 | HANDLEBINOP(Sub) |
| 784 | HANDLEBINOP(Shl) |
| 785 | HANDLEBINOP(Shr) |
| 786 | HANDLEBINOP(And) |
| 787 | HANDLEBINOP(Xor) |
| 788 | HANDLEBINOP(Or) |
| 789 | #undef HANDLEBINOP |
| 790 | |
| 791 | // Comparisons. |
| 792 | Value *EmitCompare(const BinaryOperator *E, llvm::CmpInst::Predicate UICmpOpc, |
| 793 | llvm::CmpInst::Predicate SICmpOpc, |
| 794 | llvm::CmpInst::Predicate FCmpOpc); |
| 795 | #define VISITCOMP(CODE, UI, SI, FP) \ |
| 796 | Value *VisitBin##CODE(const BinaryOperator *E) { \ |
| 797 | return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \ |
| 798 | llvm::FCmpInst::FP); } |
| 799 | VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT) |
| 800 | VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT) |
| 801 | VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE) |
| 802 | VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE) |
| 803 | VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ) |
| 804 | VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE) |
| 805 | #undef VISITCOMP |
| 806 | |
| 807 | Value *VisitBinAssign (const BinaryOperator *E); |
| 808 | |
| 809 | Value *VisitBinLAnd (const BinaryOperator *E); |
| 810 | Value *VisitBinLOr (const BinaryOperator *E); |
| 811 | Value *VisitBinComma (const BinaryOperator *E); |
| 812 | |
| 813 | Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); } |
| 814 | Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); } |
| 815 | |
| 816 | // Other Operators. |
| 817 | Value *VisitBlockExpr(const BlockExpr *BE); |
| 818 | Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *); |
| 819 | Value *VisitChooseExpr(ChooseExpr *CE); |
| 820 | Value *VisitVAArgExpr(VAArgExpr *VE); |
| 821 | Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) { |
| 822 | return CGF.EmitObjCStringLiteral(E); |
| 823 | } |
| 824 | Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) { |
| 825 | return CGF.EmitObjCBoxedExpr(E); |
| 826 | } |
| 827 | Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) { |
| 828 | return CGF.EmitObjCArrayLiteral(E); |
| 829 | } |
| 830 | Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) { |
| 831 | return CGF.EmitObjCDictionaryLiteral(E); |
| 832 | } |
| 833 | Value *VisitAsTypeExpr(AsTypeExpr *CE); |
| 834 | Value *VisitAtomicExpr(AtomicExpr *AE); |
| 835 | }; |
| 836 | } // end anonymous namespace. |
| 837 | |
| 838 | //===----------------------------------------------------------------------===// |
| 839 | // Utilities |
| 840 | //===----------------------------------------------------------------------===// |
| 841 | |
| 842 | /// EmitConversionToBool - Convert the specified expression value to a |
| 843 | /// boolean (i1) truth value. This is equivalent to "Val != 0". |
| 844 | Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) { |
| 845 | assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs")((SrcType.isCanonical() && "EmitScalarConversion strips typedefs" ) ? static_cast<void> (0) : __assert_fail ("SrcType.isCanonical() && \"EmitScalarConversion strips typedefs\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 845, __PRETTY_FUNCTION__)); |
| 846 | |
| 847 | if (SrcType->isRealFloatingType()) |
| 848 | return EmitFloatToBoolConversion(Src); |
| 849 | |
| 850 | if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType)) |
| 851 | return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT); |
| 852 | |
| 853 | assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&(((SrcType->isIntegerType() || isa<llvm::PointerType> (Src->getType())) && "Unknown scalar type to convert" ) ? static_cast<void> (0) : __assert_fail ("(SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) && \"Unknown scalar type to convert\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 854, __PRETTY_FUNCTION__)) |
| 854 | "Unknown scalar type to convert")(((SrcType->isIntegerType() || isa<llvm::PointerType> (Src->getType())) && "Unknown scalar type to convert" ) ? static_cast<void> (0) : __assert_fail ("(SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) && \"Unknown scalar type to convert\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 854, __PRETTY_FUNCTION__)); |
| 855 | |
| 856 | if (isa<llvm::IntegerType>(Src->getType())) |
| 857 | return EmitIntToBoolConversion(Src); |
| 858 | |
| 859 | assert(isa<llvm::PointerType>(Src->getType()))((isa<llvm::PointerType>(Src->getType())) ? static_cast <void> (0) : __assert_fail ("isa<llvm::PointerType>(Src->getType())" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 859, __PRETTY_FUNCTION__)); |
| 860 | return EmitPointerToBoolConversion(Src, SrcType); |
| 861 | } |
| 862 | |
| 863 | void ScalarExprEmitter::EmitFloatConversionCheck( |
| 864 | Value *OrigSrc, QualType OrigSrcType, Value *Src, QualType SrcType, |
| 865 | QualType DstType, llvm::Type *DstTy, SourceLocation Loc) { |
| 866 | assert(SrcType->isFloatingType() && "not a conversion from floating point")((SrcType->isFloatingType() && "not a conversion from floating point" ) ? static_cast<void> (0) : __assert_fail ("SrcType->isFloatingType() && \"not a conversion from floating point\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 866, __PRETTY_FUNCTION__)); |
| 867 | if (!isa<llvm::IntegerType>(DstTy)) |
| 868 | return; |
| 869 | |
| 870 | CodeGenFunction::SanitizerScope SanScope(&CGF); |
| 871 | using llvm::APFloat; |
| 872 | using llvm::APSInt; |
| 873 | |
| 874 | llvm::Value *Check = nullptr; |
| 875 | const llvm::fltSemantics &SrcSema = |
| 876 | CGF.getContext().getFloatTypeSemantics(OrigSrcType); |
| 877 | |
| 878 | // Floating-point to integer. This has undefined behavior if the source is |
| 879 | // +-Inf, NaN, or doesn't fit into the destination type (after truncation |
| 880 | // to an integer). |
| 881 | unsigned Width = CGF.getContext().getIntWidth(DstType); |
| 882 | bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType(); |
| 883 | |
| 884 | APSInt Min = APSInt::getMinValue(Width, Unsigned); |
| 885 | APFloat MinSrc(SrcSema, APFloat::uninitialized); |
| 886 | if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) & |
| 887 | APFloat::opOverflow) |
| 888 | // Don't need an overflow check for lower bound. Just check for |
| 889 | // -Inf/NaN. |
| 890 | MinSrc = APFloat::getInf(SrcSema, true); |
| 891 | else |
| 892 | // Find the largest value which is too small to represent (before |
| 893 | // truncation toward zero). |
| 894 | MinSrc.subtract(APFloat(SrcSema, 1), APFloat::rmTowardNegative); |
| 895 | |
| 896 | APSInt Max = APSInt::getMaxValue(Width, Unsigned); |
| 897 | APFloat MaxSrc(SrcSema, APFloat::uninitialized); |
| 898 | if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) & |
| 899 | APFloat::opOverflow) |
| 900 | // Don't need an overflow check for upper bound. Just check for |
| 901 | // +Inf/NaN. |
| 902 | MaxSrc = APFloat::getInf(SrcSema, false); |
| 903 | else |
| 904 | // Find the smallest value which is too large to represent (before |
| 905 | // truncation toward zero). |
| 906 | MaxSrc.add(APFloat(SrcSema, 1), APFloat::rmTowardPositive); |
| 907 | |
| 908 | // If we're converting from __half, convert the range to float to match |
| 909 | // the type of src. |
| 910 | if (OrigSrcType->isHalfType()) { |
| 911 | const llvm::fltSemantics &Sema = |
| 912 | CGF.getContext().getFloatTypeSemantics(SrcType); |
| 913 | bool IsInexact; |
| 914 | MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact); |
| 915 | MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact); |
| 916 | } |
| 917 | |
| 918 | llvm::Value *GE = |
| 919 | Builder.CreateFCmpOGT(Src, llvm::ConstantFP::get(VMContext, MinSrc)); |
| 920 | llvm::Value *LE = |
| 921 | Builder.CreateFCmpOLT(Src, llvm::ConstantFP::get(VMContext, MaxSrc)); |
| 922 | Check = Builder.CreateAnd(GE, LE); |
| 923 | |
| 924 | llvm::Constant *StaticArgs[] = {CGF.EmitCheckSourceLocation(Loc), |
| 925 | CGF.EmitCheckTypeDescriptor(OrigSrcType), |
| 926 | CGF.EmitCheckTypeDescriptor(DstType)}; |
| 927 | CGF.EmitCheck(std::make_pair(Check, SanitizerKind::FloatCastOverflow), |
| 928 | SanitizerHandler::FloatCastOverflow, StaticArgs, OrigSrc); |
| 929 | } |
| 930 | |
| 931 | // Should be called within CodeGenFunction::SanitizerScope RAII scope. |
| 932 | // Returns 'i1 false' when the truncation Src -> Dst was lossy. |
| 933 | static std::pair<ScalarExprEmitter::ImplicitConversionCheckKind, |
| 934 | std::pair<llvm::Value *, SanitizerMask>> |
| 935 | EmitIntegerTruncationCheckHelper(Value *Src, QualType SrcType, Value *Dst, |
| 936 | QualType DstType, CGBuilderTy &Builder) { |
| 937 | llvm::Type *SrcTy = Src->getType(); |
| 938 | llvm::Type *DstTy = Dst->getType(); |
| 939 | (void)DstTy; // Only used in assert() |
| 940 | |
| 941 | // This should be truncation of integral types. |
| 942 | assert(Src != Dst)((Src != Dst) ? static_cast<void> (0) : __assert_fail ( "Src != Dst", "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 942, __PRETTY_FUNCTION__)); |
| 943 | assert(SrcTy->getScalarSizeInBits() > Dst->getType()->getScalarSizeInBits())((SrcTy->getScalarSizeInBits() > Dst->getType()-> getScalarSizeInBits()) ? static_cast<void> (0) : __assert_fail ("SrcTy->getScalarSizeInBits() > Dst->getType()->getScalarSizeInBits()" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 943, __PRETTY_FUNCTION__)); |
| 944 | assert(isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) &&((isa<llvm::IntegerType>(SrcTy) && isa<llvm:: IntegerType>(DstTy) && "non-integer llvm type") ? static_cast <void> (0) : __assert_fail ("isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) && \"non-integer llvm type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 945, __PRETTY_FUNCTION__)) |
| 945 | "non-integer llvm type")((isa<llvm::IntegerType>(SrcTy) && isa<llvm:: IntegerType>(DstTy) && "non-integer llvm type") ? static_cast <void> (0) : __assert_fail ("isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) && \"non-integer llvm type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 945, __PRETTY_FUNCTION__)); |
| 946 | |
| 947 | bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType(); |
| 948 | bool DstSigned = DstType->isSignedIntegerOrEnumerationType(); |
| 949 | |
| 950 | // If both (src and dst) types are unsigned, then it's an unsigned truncation. |
| 951 | // Else, it is a signed truncation. |
| 952 | ScalarExprEmitter::ImplicitConversionCheckKind Kind; |
| 953 | SanitizerMask Mask; |
| 954 | if (!SrcSigned && !DstSigned) { |
| 955 | Kind = ScalarExprEmitter::ICCK_UnsignedIntegerTruncation; |
| 956 | Mask = SanitizerKind::ImplicitUnsignedIntegerTruncation; |
| 957 | } else { |
| 958 | Kind = ScalarExprEmitter::ICCK_SignedIntegerTruncation; |
| 959 | Mask = SanitizerKind::ImplicitSignedIntegerTruncation; |
| 960 | } |
| 961 | |
| 962 | llvm::Value *Check = nullptr; |
| 963 | // 1. Extend the truncated value back to the same width as the Src. |
| 964 | Check = Builder.CreateIntCast(Dst, SrcTy, DstSigned, "anyext"); |
| 965 | // 2. Equality-compare with the original source value |
| 966 | Check = Builder.CreateICmpEQ(Check, Src, "truncheck"); |
| 967 | // If the comparison result is 'i1 false', then the truncation was lossy. |
| 968 | return std::make_pair(Kind, std::make_pair(Check, Mask)); |
| 969 | } |
| 970 | |
| 971 | void ScalarExprEmitter::EmitIntegerTruncationCheck(Value *Src, QualType SrcType, |
| 972 | Value *Dst, QualType DstType, |
| 973 | SourceLocation Loc) { |
| 974 | if (!CGF.SanOpts.hasOneOf(SanitizerKind::ImplicitIntegerTruncation)) |
| 975 | return; |
| 976 | |
| 977 | // We only care about int->int conversions here. |
| 978 | // We ignore conversions to/from pointer and/or bool. |
| 979 | if (!(SrcType->isIntegerType() && DstType->isIntegerType())) |
| 980 | return; |
| 981 | |
| 982 | unsigned SrcBits = Src->getType()->getScalarSizeInBits(); |
| 983 | unsigned DstBits = Dst->getType()->getScalarSizeInBits(); |
| 984 | // This must be truncation. Else we do not care. |
| 985 | if (SrcBits <= DstBits) |
| 986 | return; |
| 987 | |
| 988 | assert(!DstType->isBooleanType() && "we should not get here with booleans.")((!DstType->isBooleanType() && "we should not get here with booleans." ) ? static_cast<void> (0) : __assert_fail ("!DstType->isBooleanType() && \"we should not get here with booleans.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 988, __PRETTY_FUNCTION__)); |
| 989 | |
| 990 | // If the integer sign change sanitizer is enabled, |
| 991 | // and we are truncating from larger unsigned type to smaller signed type, |
| 992 | // let that next sanitizer deal with it. |
| 993 | bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType(); |
| 994 | bool DstSigned = DstType->isSignedIntegerOrEnumerationType(); |
| 995 | if (CGF.SanOpts.has(SanitizerKind::ImplicitIntegerSignChange) && |
| 996 | (!SrcSigned && DstSigned)) |
| 997 | return; |
| 998 | |
| 999 | CodeGenFunction::SanitizerScope SanScope(&CGF); |
| 1000 | |
| 1001 | std::pair<ScalarExprEmitter::ImplicitConversionCheckKind, |
| 1002 | std::pair<llvm::Value *, SanitizerMask>> |
| 1003 | Check = |
| 1004 | EmitIntegerTruncationCheckHelper(Src, SrcType, Dst, DstType, Builder); |
| 1005 | // If the comparison result is 'i1 false', then the truncation was lossy. |
| 1006 | |
| 1007 | // Do we care about this type of truncation? |
| 1008 | if (!CGF.SanOpts.has(Check.second.second)) |
| 1009 | return; |
| 1010 | |
| 1011 | llvm::Constant *StaticArgs[] = { |
| 1012 | CGF.EmitCheckSourceLocation(Loc), CGF.EmitCheckTypeDescriptor(SrcType), |
| 1013 | CGF.EmitCheckTypeDescriptor(DstType), |
| 1014 | llvm::ConstantInt::get(Builder.getInt8Ty(), Check.first)}; |
| 1015 | CGF.EmitCheck(Check.second, SanitizerHandler::ImplicitConversion, StaticArgs, |
| 1016 | {Src, Dst}); |
| 1017 | } |
| 1018 | |
| 1019 | // Should be called within CodeGenFunction::SanitizerScope RAII scope. |
| 1020 | // Returns 'i1 false' when the conversion Src -> Dst changed the sign. |
| 1021 | static std::pair<ScalarExprEmitter::ImplicitConversionCheckKind, |
| 1022 | std::pair<llvm::Value *, SanitizerMask>> |
| 1023 | EmitIntegerSignChangeCheckHelper(Value *Src, QualType SrcType, Value *Dst, |
| 1024 | QualType DstType, CGBuilderTy &Builder) { |
| 1025 | llvm::Type *SrcTy = Src->getType(); |
| 1026 | llvm::Type *DstTy = Dst->getType(); |
| 1027 | |
| 1028 | assert(isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) &&((isa<llvm::IntegerType>(SrcTy) && isa<llvm:: IntegerType>(DstTy) && "non-integer llvm type") ? static_cast <void> (0) : __assert_fail ("isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) && \"non-integer llvm type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1029, __PRETTY_FUNCTION__)) |
| 1029 | "non-integer llvm type")((isa<llvm::IntegerType>(SrcTy) && isa<llvm:: IntegerType>(DstTy) && "non-integer llvm type") ? static_cast <void> (0) : __assert_fail ("isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) && \"non-integer llvm type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1029, __PRETTY_FUNCTION__)); |
| 1030 | |
| 1031 | bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType(); |
| 1032 | bool DstSigned = DstType->isSignedIntegerOrEnumerationType(); |
| 1033 | (void)SrcSigned; // Only used in assert() |
| 1034 | (void)DstSigned; // Only used in assert() |
| 1035 | unsigned SrcBits = SrcTy->getScalarSizeInBits(); |
| 1036 | unsigned DstBits = DstTy->getScalarSizeInBits(); |
| 1037 | (void)SrcBits; // Only used in assert() |
| 1038 | (void)DstBits; // Only used in assert() |
| 1039 | |
| 1040 | assert(((SrcBits != DstBits) || (SrcSigned != DstSigned)) &&((((SrcBits != DstBits) || (SrcSigned != DstSigned)) && "either the widths should be different, or the signednesses." ) ? static_cast<void> (0) : __assert_fail ("((SrcBits != DstBits) || (SrcSigned != DstSigned)) && \"either the widths should be different, or the signednesses.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1041, __PRETTY_FUNCTION__)) |
| 1041 | "either the widths should be different, or the signednesses.")((((SrcBits != DstBits) || (SrcSigned != DstSigned)) && "either the widths should be different, or the signednesses." ) ? static_cast<void> (0) : __assert_fail ("((SrcBits != DstBits) || (SrcSigned != DstSigned)) && \"either the widths should be different, or the signednesses.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1041, __PRETTY_FUNCTION__)); |
| 1042 | |
| 1043 | // NOTE: zero value is considered to be non-negative. |
| 1044 | auto EmitIsNegativeTest = [&Builder](Value *V, QualType VType, |
| 1045 | const char *Name) -> Value * { |
| 1046 | // Is this value a signed type? |
| 1047 | bool VSigned = VType->isSignedIntegerOrEnumerationType(); |
| 1048 | llvm::Type *VTy = V->getType(); |
| 1049 | if (!VSigned) { |
| 1050 | // If the value is unsigned, then it is never negative. |
| 1051 | // FIXME: can we encounter non-scalar VTy here? |
| 1052 | return llvm::ConstantInt::getFalse(VTy->getContext()); |
| 1053 | } |
| 1054 | // Get the zero of the same type with which we will be comparing. |
| 1055 | llvm::Constant *Zero = llvm::ConstantInt::get(VTy, 0); |
| 1056 | // %V.isnegative = icmp slt %V, 0 |
| 1057 | // I.e is %V *strictly* less than zero, does it have negative value? |
| 1058 | return Builder.CreateICmp(llvm::ICmpInst::ICMP_SLT, V, Zero, |
| 1059 | llvm::Twine(Name) + "." + V->getName() + |
| 1060 | ".negativitycheck"); |
| 1061 | }; |
| 1062 | |
| 1063 | // 1. Was the old Value negative? |
| 1064 | llvm::Value *SrcIsNegative = EmitIsNegativeTest(Src, SrcType, "src"); |
| 1065 | // 2. Is the new Value negative? |
| 1066 | llvm::Value *DstIsNegative = EmitIsNegativeTest(Dst, DstType, "dst"); |
| 1067 | // 3. Now, was the 'negativity status' preserved during the conversion? |
| 1068 | // NOTE: conversion from negative to zero is considered to change the sign. |
| 1069 | // (We want to get 'false' when the conversion changed the sign) |
| 1070 | // So we should just equality-compare the negativity statuses. |
| 1071 | llvm::Value *Check = nullptr; |
| 1072 | Check = Builder.CreateICmpEQ(SrcIsNegative, DstIsNegative, "signchangecheck"); |
| 1073 | // If the comparison result is 'false', then the conversion changed the sign. |
| 1074 | return std::make_pair( |
| 1075 | ScalarExprEmitter::ICCK_IntegerSignChange, |
| 1076 | std::make_pair(Check, SanitizerKind::ImplicitIntegerSignChange)); |
| 1077 | } |
| 1078 | |
| 1079 | void ScalarExprEmitter::EmitIntegerSignChangeCheck(Value *Src, QualType SrcType, |
| 1080 | Value *Dst, QualType DstType, |
| 1081 | SourceLocation Loc) { |
| 1082 | if (!CGF.SanOpts.has(SanitizerKind::ImplicitIntegerSignChange)) |
| 1083 | return; |
| 1084 | |
| 1085 | llvm::Type *SrcTy = Src->getType(); |
| 1086 | llvm::Type *DstTy = Dst->getType(); |
| 1087 | |
| 1088 | // We only care about int->int conversions here. |
| 1089 | // We ignore conversions to/from pointer and/or bool. |
| 1090 | if (!(SrcType->isIntegerType() && DstType->isIntegerType())) |
| 1091 | return; |
| 1092 | |
| 1093 | bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType(); |
| 1094 | bool DstSigned = DstType->isSignedIntegerOrEnumerationType(); |
| 1095 | unsigned SrcBits = SrcTy->getScalarSizeInBits(); |
| 1096 | unsigned DstBits = DstTy->getScalarSizeInBits(); |
| 1097 | |
| 1098 | // Now, we do not need to emit the check in *all* of the cases. |
| 1099 | // We can avoid emitting it in some obvious cases where it would have been |
| 1100 | // dropped by the opt passes (instcombine) always anyways. |
| 1101 | // If it's a cast between effectively the same type, no check. |
| 1102 | // NOTE: this is *not* equivalent to checking the canonical types. |
| 1103 | if (SrcSigned == DstSigned && SrcBits == DstBits) |
| 1104 | return; |
| 1105 | // At least one of the values needs to have signed type. |
| 1106 | // If both are unsigned, then obviously, neither of them can be negative. |
| 1107 | if (!SrcSigned && !DstSigned) |
| 1108 | return; |
| 1109 | // If the conversion is to *larger* *signed* type, then no check is needed. |
| 1110 | // Because either sign-extension happens (so the sign will remain), |
| 1111 | // or zero-extension will happen (the sign bit will be zero.) |
| 1112 | if ((DstBits > SrcBits) && DstSigned) |
| 1113 | return; |
| 1114 | if (CGF.SanOpts.has(SanitizerKind::ImplicitSignedIntegerTruncation) && |
| 1115 | (SrcBits > DstBits) && SrcSigned) { |
| 1116 | // If the signed integer truncation sanitizer is enabled, |
| 1117 | // and this is a truncation from signed type, then no check is needed. |
| 1118 | // Because here sign change check is interchangeable with truncation check. |
| 1119 | return; |
| 1120 | } |
| 1121 | // That's it. We can't rule out any more cases with the data we have. |
| 1122 | |
| 1123 | CodeGenFunction::SanitizerScope SanScope(&CGF); |
| 1124 | |
| 1125 | std::pair<ScalarExprEmitter::ImplicitConversionCheckKind, |
| 1126 | std::pair<llvm::Value *, SanitizerMask>> |
| 1127 | Check; |
| 1128 | |
| 1129 | // Each of these checks needs to return 'false' when an issue was detected. |
| 1130 | ImplicitConversionCheckKind CheckKind; |
| 1131 | llvm::SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks; |
| 1132 | // So we can 'and' all the checks together, and still get 'false', |
| 1133 | // if at least one of the checks detected an issue. |
| 1134 | |
| 1135 | Check = EmitIntegerSignChangeCheckHelper(Src, SrcType, Dst, DstType, Builder); |
| 1136 | CheckKind = Check.first; |
| 1137 | Checks.emplace_back(Check.second); |
| 1138 | |
| 1139 | if (CGF.SanOpts.has(SanitizerKind::ImplicitSignedIntegerTruncation) && |
| 1140 | (SrcBits > DstBits) && !SrcSigned && DstSigned) { |
| 1141 | // If the signed integer truncation sanitizer was enabled, |
| 1142 | // and we are truncating from larger unsigned type to smaller signed type, |
| 1143 | // let's handle the case we skipped in that check. |
| 1144 | Check = |
| 1145 | EmitIntegerTruncationCheckHelper(Src, SrcType, Dst, DstType, Builder); |
| 1146 | CheckKind = ICCK_SignedIntegerTruncationOrSignChange; |
| 1147 | Checks.emplace_back(Check.second); |
| 1148 | // If the comparison result is 'i1 false', then the truncation was lossy. |
| 1149 | } |
| 1150 | |
| 1151 | llvm::Constant *StaticArgs[] = { |
| 1152 | CGF.EmitCheckSourceLocation(Loc), CGF.EmitCheckTypeDescriptor(SrcType), |
| 1153 | CGF.EmitCheckTypeDescriptor(DstType), |
| 1154 | llvm::ConstantInt::get(Builder.getInt8Ty(), CheckKind)}; |
| 1155 | // EmitCheck() will 'and' all the checks together. |
| 1156 | CGF.EmitCheck(Checks, SanitizerHandler::ImplicitConversion, StaticArgs, |
| 1157 | {Src, Dst}); |
| 1158 | } |
| 1159 | |
| 1160 | /// Emit a conversion from the specified type to the specified destination type, |
| 1161 | /// both of which are LLVM scalar types. |
| 1162 | Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType, |
| 1163 | QualType DstType, |
| 1164 | SourceLocation Loc, |
| 1165 | ScalarConversionOpts Opts) { |
| 1166 | // All conversions involving fixed point types should be handled by the |
| 1167 | // EmitFixedPoint family functions. This is done to prevent bloating up this |
| 1168 | // function more, and although fixed point numbers are represented by |
| 1169 | // integers, we do not want to follow any logic that assumes they should be |
| 1170 | // treated as integers. |
| 1171 | // TODO(leonardchan): When necessary, add another if statement checking for |
| 1172 | // conversions to fixed point types from other types. |
| 1173 | if (SrcType->isFixedPointType()) { |
| 1174 | if (DstType->isBooleanType()) |
| 1175 | // It is important that we check this before checking if the dest type is |
| 1176 | // an integer because booleans are technically integer types. |
| 1177 | // We do not need to check the padding bit on unsigned types if unsigned |
| 1178 | // padding is enabled because overflow into this bit is undefined |
| 1179 | // behavior. |
| 1180 | return Builder.CreateIsNotNull(Src, "tobool"); |
| 1181 | if (DstType->isFixedPointType() || DstType->isIntegerType()) |
| 1182 | return EmitFixedPointConversion(Src, SrcType, DstType, Loc); |
| 1183 | |
| 1184 | llvm_unreachable(::llvm::llvm_unreachable_internal("Unhandled scalar conversion from a fixed point type to another type." , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1185) |
| 1185 | "Unhandled scalar conversion from a fixed point type to another type.")::llvm::llvm_unreachable_internal("Unhandled scalar conversion from a fixed point type to another type." , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1185); |
| 1186 | } else if (DstType->isFixedPointType()) { |
| 1187 | if (SrcType->isIntegerType()) |
| 1188 | // This also includes converting booleans and enums to fixed point types. |
| 1189 | return EmitFixedPointConversion(Src, SrcType, DstType, Loc); |
| 1190 | |
| 1191 | llvm_unreachable(::llvm::llvm_unreachable_internal("Unhandled scalar conversion to a fixed point type from another type." , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1192) |
| 1192 | "Unhandled scalar conversion to a fixed point type from another type.")::llvm::llvm_unreachable_internal("Unhandled scalar conversion to a fixed point type from another type." , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1192); |
| 1193 | } |
| 1194 | |
| 1195 | QualType NoncanonicalSrcType = SrcType; |
| 1196 | QualType NoncanonicalDstType = DstType; |
| 1197 | |
| 1198 | SrcType = CGF.getContext().getCanonicalType(SrcType); |
| 1199 | DstType = CGF.getContext().getCanonicalType(DstType); |
| 1200 | if (SrcType == DstType) return Src; |
| 1201 | |
| 1202 | if (DstType->isVoidType()) return nullptr; |
| 1203 | |
| 1204 | llvm::Value *OrigSrc = Src; |
| 1205 | QualType OrigSrcType = SrcType; |
| 1206 | llvm::Type *SrcTy = Src->getType(); |
| 1207 | |
| 1208 | // Handle conversions to bool first, they are special: comparisons against 0. |
| 1209 | if (DstType->isBooleanType()) |
| 1210 | return EmitConversionToBool(Src, SrcType); |
| 1211 | |
| 1212 | llvm::Type *DstTy = ConvertType(DstType); |
| 1213 | |
| 1214 | // Cast from half through float if half isn't a native type. |
| 1215 | if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) { |
| 1216 | // Cast to FP using the intrinsic if the half type itself isn't supported. |
| 1217 | if (DstTy->isFloatingPointTy()) { |
| 1218 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) |
| 1219 | return Builder.CreateCall( |
| 1220 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, DstTy), |
| 1221 | Src); |
| 1222 | } else { |
| 1223 | // Cast to other types through float, using either the intrinsic or FPExt, |
| 1224 | // depending on whether the half type itself is supported |
| 1225 | // (as opposed to operations on half, available with NativeHalfType). |
| 1226 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) { |
| 1227 | Src = Builder.CreateCall( |
| 1228 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, |
| 1229 | CGF.CGM.FloatTy), |
| 1230 | Src); |
| 1231 | } else { |
| 1232 | Src = Builder.CreateFPExt(Src, CGF.CGM.FloatTy, "conv"); |
| 1233 | } |
| 1234 | SrcType = CGF.getContext().FloatTy; |
| 1235 | SrcTy = CGF.FloatTy; |
| 1236 | } |
| 1237 | } |
| 1238 | |
| 1239 | // Ignore conversions like int -> uint. |
| 1240 | if (SrcTy == DstTy) { |
| 1241 | if (Opts.EmitImplicitIntegerSignChangeChecks) |
| 1242 | EmitIntegerSignChangeCheck(Src, NoncanonicalSrcType, Src, |
| 1243 | NoncanonicalDstType, Loc); |
| 1244 | |
| 1245 | return Src; |
| 1246 | } |
| 1247 | |
| 1248 | // Handle pointer conversions next: pointers can only be converted to/from |
| 1249 | // other pointers and integers. Check for pointer types in terms of LLVM, as |
| 1250 | // some native types (like Obj-C id) may map to a pointer type. |
| 1251 | if (auto DstPT = dyn_cast<llvm::PointerType>(DstTy)) { |
| 1252 | // The source value may be an integer, or a pointer. |
| 1253 | if (isa<llvm::PointerType>(SrcTy)) |
| 1254 | return Builder.CreateBitCast(Src, DstTy, "conv"); |
| 1255 | |
| 1256 | assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?")((SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?" ) ? static_cast<void> (0) : __assert_fail ("SrcType->isIntegerType() && \"Not ptr->ptr or int->ptr conversion?\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1256, __PRETTY_FUNCTION__)); |
| 1257 | // First, convert to the correct width so that we control the kind of |
| 1258 | // extension. |
| 1259 | llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DstPT); |
| 1260 | bool InputSigned = SrcType->isSignedIntegerOrEnumerationType(); |
| 1261 | llvm::Value* IntResult = |
| 1262 | Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv"); |
| 1263 | // Then, cast to pointer. |
| 1264 | return Builder.CreateIntToPtr(IntResult, DstTy, "conv"); |
| 1265 | } |
| 1266 | |
| 1267 | if (isa<llvm::PointerType>(SrcTy)) { |
| 1268 | // Must be an ptr to int cast. |
| 1269 | assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?")((isa<llvm::IntegerType>(DstTy) && "not ptr->int?" ) ? static_cast<void> (0) : __assert_fail ("isa<llvm::IntegerType>(DstTy) && \"not ptr->int?\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1269, __PRETTY_FUNCTION__)); |
| 1270 | return Builder.CreatePtrToInt(Src, DstTy, "conv"); |
| 1271 | } |
| 1272 | |
| 1273 | // A scalar can be splatted to an extended vector of the same element type |
| 1274 | if (DstType->isExtVectorType() && !SrcType->isVectorType()) { |
| 1275 | // Sema should add casts to make sure that the source expression's type is |
| 1276 | // the same as the vector's element type (sans qualifiers) |
| 1277 | assert(DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() ==((DstType->castAs<ExtVectorType>()->getElementType ().getTypePtr() == SrcType.getTypePtr() && "Splatted expr doesn't match with vector element type?" ) ? static_cast<void> (0) : __assert_fail ("DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() == SrcType.getTypePtr() && \"Splatted expr doesn't match with vector element type?\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1279, __PRETTY_FUNCTION__)) |
| 1278 | SrcType.getTypePtr() &&((DstType->castAs<ExtVectorType>()->getElementType ().getTypePtr() == SrcType.getTypePtr() && "Splatted expr doesn't match with vector element type?" ) ? static_cast<void> (0) : __assert_fail ("DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() == SrcType.getTypePtr() && \"Splatted expr doesn't match with vector element type?\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1279, __PRETTY_FUNCTION__)) |
| 1279 | "Splatted expr doesn't match with vector element type?")((DstType->castAs<ExtVectorType>()->getElementType ().getTypePtr() == SrcType.getTypePtr() && "Splatted expr doesn't match with vector element type?" ) ? static_cast<void> (0) : __assert_fail ("DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() == SrcType.getTypePtr() && \"Splatted expr doesn't match with vector element type?\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1279, __PRETTY_FUNCTION__)); |
| 1280 | |
| 1281 | // Splat the element across to all elements |
| 1282 | unsigned NumElements = DstTy->getVectorNumElements(); |
| 1283 | return Builder.CreateVectorSplat(NumElements, Src, "splat"); |
| 1284 | } |
| 1285 | |
| 1286 | if (isa<llvm::VectorType>(SrcTy) || isa<llvm::VectorType>(DstTy)) { |
| 1287 | // Allow bitcast from vector to integer/fp of the same size. |
| 1288 | unsigned SrcSize = SrcTy->getPrimitiveSizeInBits(); |
| 1289 | unsigned DstSize = DstTy->getPrimitiveSizeInBits(); |
| 1290 | if (SrcSize == DstSize) |
| 1291 | return Builder.CreateBitCast(Src, DstTy, "conv"); |
| 1292 | |
| 1293 | // Conversions between vectors of different sizes are not allowed except |
| 1294 | // when vectors of half are involved. Operations on storage-only half |
| 1295 | // vectors require promoting half vector operands to float vectors and |
| 1296 | // truncating the result, which is either an int or float vector, to a |
| 1297 | // short or half vector. |
| 1298 | |
| 1299 | // Source and destination are both expected to be vectors. |
| 1300 | llvm::Type *SrcElementTy = SrcTy->getVectorElementType(); |
| 1301 | llvm::Type *DstElementTy = DstTy->getVectorElementType(); |
| 1302 | (void)DstElementTy; |
| 1303 | |
| 1304 | assert(((SrcElementTy->isIntegerTy() &&((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1309, __PRETTY_FUNCTION__)) |
| 1305 | DstElementTy->isIntegerTy()) ||((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1309, __PRETTY_FUNCTION__)) |
| 1306 | (SrcElementTy->isFloatingPointTy() &&((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1309, __PRETTY_FUNCTION__)) |
| 1307 | DstElementTy->isFloatingPointTy())) &&((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1309, __PRETTY_FUNCTION__)) |
| 1308 | "unexpected conversion between a floating-point vector and an "((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1309, __PRETTY_FUNCTION__)) |
| 1309 | "integer vector")((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1309, __PRETTY_FUNCTION__)); |
| 1310 | |
| 1311 | // Truncate an i32 vector to an i16 vector. |
| 1312 | if (SrcElementTy->isIntegerTy()) |
| 1313 | return Builder.CreateIntCast(Src, DstTy, false, "conv"); |
| 1314 | |
| 1315 | // Truncate a float vector to a half vector. |
| 1316 | if (SrcSize > DstSize) |
| 1317 | return Builder.CreateFPTrunc(Src, DstTy, "conv"); |
| 1318 | |
| 1319 | // Promote a half vector to a float vector. |
| 1320 | return Builder.CreateFPExt(Src, DstTy, "conv"); |
| 1321 | } |
| 1322 | |
| 1323 | // Finally, we have the arithmetic types: real int/float. |
| 1324 | Value *Res = nullptr; |
| 1325 | llvm::Type *ResTy = DstTy; |
| 1326 | |
| 1327 | // An overflowing conversion has undefined behavior if either the source type |
| 1328 | // or the destination type is a floating-point type. However, we consider the |
| 1329 | // range of representable values for all floating-point types to be |
| 1330 | // [-inf,+inf], so no overflow can ever happen when the destination type is a |
| 1331 | // floating-point type. |
| 1332 | if (CGF.SanOpts.has(SanitizerKind::FloatCastOverflow) && |
| 1333 | OrigSrcType->isFloatingType()) |
| 1334 | EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType, DstTy, |
| 1335 | Loc); |
| 1336 | |
| 1337 | // Cast to half through float if half isn't a native type. |
| 1338 | if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) { |
| 1339 | // Make sure we cast in a single step if from another FP type. |
| 1340 | if (SrcTy->isFloatingPointTy()) { |
| 1341 | // Use the intrinsic if the half type itself isn't supported |
| 1342 | // (as opposed to operations on half, available with NativeHalfType). |
| 1343 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) |
| 1344 | return Builder.CreateCall( |
| 1345 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, SrcTy), Src); |
| 1346 | // If the half type is supported, just use an fptrunc. |
| 1347 | return Builder.CreateFPTrunc(Src, DstTy); |
| 1348 | } |
| 1349 | DstTy = CGF.FloatTy; |
| 1350 | } |
| 1351 | |
| 1352 | if (isa<llvm::IntegerType>(SrcTy)) { |
| 1353 | bool InputSigned = SrcType->isSignedIntegerOrEnumerationType(); |
| 1354 | if (SrcType->isBooleanType() && Opts.TreatBooleanAsSigned) { |
| 1355 | InputSigned = true; |
| 1356 | } |
| 1357 | if (isa<llvm::IntegerType>(DstTy)) |
| 1358 | Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv"); |
| 1359 | else if (InputSigned) |
| 1360 | Res = Builder.CreateSIToFP(Src, DstTy, "conv"); |
| 1361 | else |
| 1362 | Res = Builder.CreateUIToFP(Src, DstTy, "conv"); |
| 1363 | } else if (isa<llvm::IntegerType>(DstTy)) { |
| 1364 | assert(SrcTy->isFloatingPointTy() && "Unknown real conversion")((SrcTy->isFloatingPointTy() && "Unknown real conversion" ) ? static_cast<void> (0) : __assert_fail ("SrcTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1364, __PRETTY_FUNCTION__)); |
| 1365 | if (DstType->isSignedIntegerOrEnumerationType()) |
| 1366 | Res = Builder.CreateFPToSI(Src, DstTy, "conv"); |
| 1367 | else |
| 1368 | Res = Builder.CreateFPToUI(Src, DstTy, "conv"); |
| 1369 | } else { |
| 1370 | assert(SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() &&((SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy () && "Unknown real conversion") ? static_cast<void > (0) : __assert_fail ("SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1371, __PRETTY_FUNCTION__)) |
| 1371 | "Unknown real conversion")((SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy () && "Unknown real conversion") ? static_cast<void > (0) : __assert_fail ("SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1371, __PRETTY_FUNCTION__)); |
| 1372 | if (DstTy->getTypeID() < SrcTy->getTypeID()) |
| 1373 | Res = Builder.CreateFPTrunc(Src, DstTy, "conv"); |
| 1374 | else |
| 1375 | Res = Builder.CreateFPExt(Src, DstTy, "conv"); |
| 1376 | } |
| 1377 | |
| 1378 | if (DstTy != ResTy) { |
| 1379 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) { |
| 1380 | assert(ResTy->isIntegerTy(16) && "Only half FP requires extra conversion")((ResTy->isIntegerTy(16) && "Only half FP requires extra conversion" ) ? static_cast<void> (0) : __assert_fail ("ResTy->isIntegerTy(16) && \"Only half FP requires extra conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1380, __PRETTY_FUNCTION__)); |
| 1381 | Res = Builder.CreateCall( |
| 1382 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, CGF.CGM.FloatTy), |
| 1383 | Res); |
| 1384 | } else { |
| 1385 | Res = Builder.CreateFPTrunc(Res, ResTy, "conv"); |
| 1386 | } |
| 1387 | } |
| 1388 | |
| 1389 | if (Opts.EmitImplicitIntegerTruncationChecks) |
| 1390 | EmitIntegerTruncationCheck(Src, NoncanonicalSrcType, Res, |
| 1391 | NoncanonicalDstType, Loc); |
| 1392 | |
| 1393 | if (Opts.EmitImplicitIntegerSignChangeChecks) |
| 1394 | EmitIntegerSignChangeCheck(Src, NoncanonicalSrcType, Res, |
| 1395 | NoncanonicalDstType, Loc); |
| 1396 | |
| 1397 | return Res; |
| 1398 | } |
| 1399 | |
| 1400 | Value *ScalarExprEmitter::EmitFixedPointConversion(Value *Src, QualType SrcTy, |
| 1401 | QualType DstTy, |
| 1402 | SourceLocation Loc) { |
| 1403 | FixedPointSemantics SrcFPSema = |
| 1404 | CGF.getContext().getFixedPointSemantics(SrcTy); |
| 1405 | FixedPointSemantics DstFPSema = |
| 1406 | CGF.getContext().getFixedPointSemantics(DstTy); |
| 1407 | return EmitFixedPointConversion(Src, SrcFPSema, DstFPSema, Loc, |
| 1408 | DstTy->isIntegerType()); |
| 1409 | } |
| 1410 | |
| 1411 | Value *ScalarExprEmitter::EmitFixedPointConversion( |
| 1412 | Value *Src, FixedPointSemantics &SrcFPSema, FixedPointSemantics &DstFPSema, |
| 1413 | SourceLocation Loc, bool DstIsInteger) { |
| 1414 | using llvm::APInt; |
| 1415 | using llvm::ConstantInt; |
| 1416 | using llvm::Value; |
| 1417 | |
| 1418 | unsigned SrcWidth = SrcFPSema.getWidth(); |
| 1419 | unsigned DstWidth = DstFPSema.getWidth(); |
| 1420 | unsigned SrcScale = SrcFPSema.getScale(); |
| 1421 | unsigned DstScale = DstFPSema.getScale(); |
| 1422 | bool SrcIsSigned = SrcFPSema.isSigned(); |
| 1423 | bool DstIsSigned = DstFPSema.isSigned(); |
| 1424 | |
| 1425 | llvm::Type *DstIntTy = Builder.getIntNTy(DstWidth); |
| 1426 | |
| 1427 | Value *Result = Src; |
| 1428 | unsigned ResultWidth = SrcWidth; |
| 1429 | |
| 1430 | // Downscale. |
| 1431 | if (DstScale < SrcScale) { |
| 1432 | // When converting to integers, we round towards zero. For negative numbers, |
| 1433 | // right shifting rounds towards negative infinity. In this case, we can |
| 1434 | // just round up before shifting. |
| 1435 | if (DstIsInteger && SrcIsSigned) { |
| 1436 | Value *Zero = llvm::Constant::getNullValue(Result->getType()); |
| 1437 | Value *IsNegative = Builder.CreateICmpSLT(Result, Zero); |
| 1438 | Value *LowBits = ConstantInt::get( |
| 1439 | CGF.getLLVMContext(), APInt::getLowBitsSet(ResultWidth, SrcScale)); |
| 1440 | Value *Rounded = Builder.CreateAdd(Result, LowBits); |
| 1441 | Result = Builder.CreateSelect(IsNegative, Rounded, Result); |
| 1442 | } |
| 1443 | |
| 1444 | Result = SrcIsSigned |
| 1445 | ? Builder.CreateAShr(Result, SrcScale - DstScale, "downscale") |
| 1446 | : Builder.CreateLShr(Result, SrcScale - DstScale, "downscale"); |
| 1447 | } |
| 1448 | |
| 1449 | if (!DstFPSema.isSaturated()) { |
| 1450 | // Resize. |
| 1451 | Result = Builder.CreateIntCast(Result, DstIntTy, SrcIsSigned, "resize"); |
| 1452 | |
| 1453 | // Upscale. |
| 1454 | if (DstScale > SrcScale) |
| 1455 | Result = Builder.CreateShl(Result, DstScale - SrcScale, "upscale"); |
| 1456 | } else { |
| 1457 | // Adjust the number of fractional bits. |
| 1458 | if (DstScale > SrcScale) { |
| 1459 | // Compare to DstWidth to prevent resizing twice. |
| 1460 | ResultWidth = std::max(SrcWidth + DstScale - SrcScale, DstWidth); |
| 1461 | llvm::Type *UpscaledTy = Builder.getIntNTy(ResultWidth); |
| 1462 | Result = Builder.CreateIntCast(Result, UpscaledTy, SrcIsSigned, "resize"); |
| 1463 | Result = Builder.CreateShl(Result, DstScale - SrcScale, "upscale"); |
| 1464 | } |
| 1465 | |
| 1466 | // Handle saturation. |
| 1467 | bool LessIntBits = DstFPSema.getIntegralBits() < SrcFPSema.getIntegralBits(); |
| 1468 | if (LessIntBits) { |
| 1469 | Value *Max = ConstantInt::get( |
| 1470 | CGF.getLLVMContext(), |
| 1471 | APFixedPoint::getMax(DstFPSema).getValue().extOrTrunc(ResultWidth)); |
| 1472 | Value *TooHigh = SrcIsSigned ? Builder.CreateICmpSGT(Result, Max) |
| 1473 | : Builder.CreateICmpUGT(Result, Max); |
| 1474 | Result = Builder.CreateSelect(TooHigh, Max, Result, "satmax"); |
| 1475 | } |
| 1476 | // Cannot overflow min to dest type if src is unsigned since all fixed |
| 1477 | // point types can cover the unsigned min of 0. |
| 1478 | if (SrcIsSigned && (LessIntBits || !DstIsSigned)) { |
| 1479 | Value *Min = ConstantInt::get( |
| 1480 | CGF.getLLVMContext(), |
| 1481 | APFixedPoint::getMin(DstFPSema).getValue().extOrTrunc(ResultWidth)); |
| 1482 | Value *TooLow = Builder.CreateICmpSLT(Result, Min); |
| 1483 | Result = Builder.CreateSelect(TooLow, Min, Result, "satmin"); |
| 1484 | } |
| 1485 | |
| 1486 | // Resize the integer part to get the final destination size. |
| 1487 | if (ResultWidth != DstWidth) |
| 1488 | Result = Builder.CreateIntCast(Result, DstIntTy, SrcIsSigned, "resize"); |
| 1489 | } |
| 1490 | return Result; |
| 1491 | } |
| 1492 | |
| 1493 | /// Emit a conversion from the specified complex type to the specified |
| 1494 | /// destination type, where the destination type is an LLVM scalar type. |
| 1495 | Value *ScalarExprEmitter::EmitComplexToScalarConversion( |
| 1496 | CodeGenFunction::ComplexPairTy Src, QualType SrcTy, QualType DstTy, |
| 1497 | SourceLocation Loc) { |
| 1498 | // Get the source element type. |
| 1499 | SrcTy = SrcTy->castAs<ComplexType>()->getElementType(); |
| 1500 | |
| 1501 | // Handle conversions to bool first, they are special: comparisons against 0. |
| 1502 | if (DstTy->isBooleanType()) { |
| 1503 | // Complex != 0 -> (Real != 0) | (Imag != 0) |
| 1504 | Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy, Loc); |
| 1505 | Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy, Loc); |
| 1506 | return Builder.CreateOr(Src.first, Src.second, "tobool"); |
| 1507 | } |
| 1508 | |
| 1509 | // C99 6.3.1.7p2: "When a value of complex type is converted to a real type, |
| 1510 | // the imaginary part of the complex value is discarded and the value of the |
| 1511 | // real part is converted according to the conversion rules for the |
| 1512 | // corresponding real type. |
| 1513 | return EmitScalarConversion(Src.first, SrcTy, DstTy, Loc); |
| 1514 | } |
| 1515 | |
| 1516 | Value *ScalarExprEmitter::EmitNullValue(QualType Ty) { |
| 1517 | return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty); |
| 1518 | } |
| 1519 | |
| 1520 | /// Emit a sanitization check for the given "binary" operation (which |
| 1521 | /// might actually be a unary increment which has been lowered to a binary |
| 1522 | /// operation). The check passes if all values in \p Checks (which are \c i1), |
| 1523 | /// are \c true. |
| 1524 | void ScalarExprEmitter::EmitBinOpCheck( |
| 1525 | ArrayRef<std::pair<Value *, SanitizerMask>> Checks, const BinOpInfo &Info) { |
| 1526 | assert(CGF.IsSanitizerScope)((CGF.IsSanitizerScope) ? static_cast<void> (0) : __assert_fail ("CGF.IsSanitizerScope", "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1526, __PRETTY_FUNCTION__)); |
| 1527 | SanitizerHandler Check; |
| 1528 | SmallVector<llvm::Constant *, 4> StaticData; |
| 1529 | SmallVector<llvm::Value *, 2> DynamicData; |
| 1530 | |
| 1531 | BinaryOperatorKind Opcode = Info.Opcode; |
| 1532 | if (BinaryOperator::isCompoundAssignmentOp(Opcode)) |
| 1533 | Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode); |
| 1534 | |
| 1535 | StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc())); |
| 1536 | const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E); |
| 1537 | if (UO && UO->getOpcode() == UO_Minus) { |
| 1538 | Check = SanitizerHandler::NegateOverflow; |
| 1539 | StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType())); |
| 1540 | DynamicData.push_back(Info.RHS); |
| 1541 | } else { |
| 1542 | if (BinaryOperator::isShiftOp(Opcode)) { |
| 1543 | // Shift LHS negative or too large, or RHS out of bounds. |
| 1544 | Check = SanitizerHandler::ShiftOutOfBounds; |
| 1545 | const BinaryOperator *BO = cast<BinaryOperator>(Info.E); |
| 1546 | StaticData.push_back( |
| 1547 | CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType())); |
| 1548 | StaticData.push_back( |
| 1549 | CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType())); |
| 1550 | } else if (Opcode == BO_Div || Opcode == BO_Rem) { |
| 1551 | // Divide or modulo by zero, or signed overflow (eg INT_MAX / -1). |
| 1552 | Check = SanitizerHandler::DivremOverflow; |
| 1553 | StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty)); |
| 1554 | } else { |
| 1555 | // Arithmetic overflow (+, -, *). |
| 1556 | switch (Opcode) { |
| 1557 | case BO_Add: Check = SanitizerHandler::AddOverflow; break; |
| 1558 | case BO_Sub: Check = SanitizerHandler::SubOverflow; break; |
| 1559 | case BO_Mul: Check = SanitizerHandler::MulOverflow; break; |
| 1560 | default: llvm_unreachable("unexpected opcode for bin op check")::llvm::llvm_unreachable_internal("unexpected opcode for bin op check" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1560); |
| 1561 | } |
| 1562 | StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty)); |
| 1563 | } |
| 1564 | DynamicData.push_back(Info.LHS); |
| 1565 | DynamicData.push_back(Info.RHS); |
| 1566 | } |
| 1567 | |
| 1568 | CGF.EmitCheck(Checks, Check, StaticData, DynamicData); |
| 1569 | } |
| 1570 | |
| 1571 | //===----------------------------------------------------------------------===// |
| 1572 | // Visitor Methods |
| 1573 | //===----------------------------------------------------------------------===// |
| 1574 | |
| 1575 | Value *ScalarExprEmitter::VisitExpr(Expr *E) { |
| 1576 | CGF.ErrorUnsupported(E, "scalar expression"); |
| 1577 | if (E->getType()->isVoidType()) |
| 1578 | return nullptr; |
| 1579 | return llvm::UndefValue::get(CGF.ConvertType(E->getType())); |
| 1580 | } |
| 1581 | |
| 1582 | Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) { |
| 1583 | // Vector Mask Case |
| 1584 | if (E->getNumSubExprs() == 2) { |
| 1585 | Value *LHS = CGF.EmitScalarExpr(E->getExpr(0)); |
| 1586 | Value *RHS = CGF.EmitScalarExpr(E->getExpr(1)); |
| 1587 | Value *Mask; |
| 1588 | |
| 1589 | llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType()); |
| 1590 | unsigned LHSElts = LTy->getNumElements(); |
| 1591 | |
| 1592 | Mask = RHS; |
| 1593 | |
| 1594 | llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType()); |
| 1595 | |
| 1596 | // Mask off the high bits of each shuffle index. |
| 1597 | Value *MaskBits = |
| 1598 | llvm::ConstantInt::get(MTy, llvm::NextPowerOf2(LHSElts - 1) - 1); |
| 1599 | Mask = Builder.CreateAnd(Mask, MaskBits, "mask"); |
| 1600 | |
| 1601 | // newv = undef |
| 1602 | // mask = mask & maskbits |
| 1603 | // for each elt |
| 1604 | // n = extract mask i |
| 1605 | // x = extract val n |
| 1606 | // newv = insert newv, x, i |
| 1607 | llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(), |
| 1608 | MTy->getNumElements()); |
| 1609 | Value* NewV = llvm::UndefValue::get(RTy); |
| 1610 | for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) { |
| 1611 | Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i); |
| 1612 | Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx"); |
| 1613 | |
| 1614 | Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt"); |
| 1615 | NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins"); |
| 1616 | } |
| 1617 | return NewV; |
| 1618 | } |
| 1619 | |
| 1620 | Value* V1 = CGF.EmitScalarExpr(E->getExpr(0)); |
| 1621 | Value* V2 = CGF.EmitScalarExpr(E->getExpr(1)); |
| 1622 | |
| 1623 | SmallVector<llvm::Constant*, 32> indices; |
| 1624 | for (unsigned i = 2; i < E->getNumSubExprs(); ++i) { |
| 1625 | llvm::APSInt Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2); |
| 1626 | // Check for -1 and output it as undef in the IR. |
| 1627 | if (Idx.isSigned() && Idx.isAllOnesValue()) |
| 1628 | indices.push_back(llvm::UndefValue::get(CGF.Int32Ty)); |
| 1629 | else |
| 1630 | indices.push_back(Builder.getInt32(Idx.getZExtValue())); |
| 1631 | } |
| 1632 | |
| 1633 | Value *SV = llvm::ConstantVector::get(indices); |
| 1634 | return Builder.CreateShuffleVector(V1, V2, SV, "shuffle"); |
| 1635 | } |
| 1636 | |
| 1637 | Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) { |
| 1638 | QualType SrcType = E->getSrcExpr()->getType(), |
| 1639 | DstType = E->getType(); |
| 1640 | |
| 1641 | Value *Src = CGF.EmitScalarExpr(E->getSrcExpr()); |
| 1642 | |
| 1643 | SrcType = CGF.getContext().getCanonicalType(SrcType); |
| 1644 | DstType = CGF.getContext().getCanonicalType(DstType); |
| 1645 | if (SrcType == DstType) return Src; |
| 1646 | |
| 1647 | assert(SrcType->isVectorType() &&((SrcType->isVectorType() && "ConvertVector source type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("SrcType->isVectorType() && \"ConvertVector source type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1648, __PRETTY_FUNCTION__)) |
| 1648 | "ConvertVector source type must be a vector")((SrcType->isVectorType() && "ConvertVector source type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("SrcType->isVectorType() && \"ConvertVector source type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1648, __PRETTY_FUNCTION__)); |
| 1649 | assert(DstType->isVectorType() &&((DstType->isVectorType() && "ConvertVector destination type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("DstType->isVectorType() && \"ConvertVector destination type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1650, __PRETTY_FUNCTION__)) |
| 1650 | "ConvertVector destination type must be a vector")((DstType->isVectorType() && "ConvertVector destination type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("DstType->isVectorType() && \"ConvertVector destination type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1650, __PRETTY_FUNCTION__)); |
| 1651 | |
| 1652 | llvm::Type *SrcTy = Src->getType(); |
| 1653 | llvm::Type *DstTy = ConvertType(DstType); |
| 1654 | |
| 1655 | // Ignore conversions like int -> uint. |
| 1656 | if (SrcTy == DstTy) |
| 1657 | return Src; |
| 1658 | |
| 1659 | QualType SrcEltType = SrcType->castAs<VectorType>()->getElementType(), |
| 1660 | DstEltType = DstType->castAs<VectorType>()->getElementType(); |
| 1661 | |
| 1662 | assert(SrcTy->isVectorTy() &&((SrcTy->isVectorTy() && "ConvertVector source IR type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("SrcTy->isVectorTy() && \"ConvertVector source IR type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1663, __PRETTY_FUNCTION__)) |
| 1663 | "ConvertVector source IR type must be a vector")((SrcTy->isVectorTy() && "ConvertVector source IR type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("SrcTy->isVectorTy() && \"ConvertVector source IR type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1663, __PRETTY_FUNCTION__)); |
| 1664 | assert(DstTy->isVectorTy() &&((DstTy->isVectorTy() && "ConvertVector destination IR type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("DstTy->isVectorTy() && \"ConvertVector destination IR type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1665, __PRETTY_FUNCTION__)) |
| 1665 | "ConvertVector destination IR type must be a vector")((DstTy->isVectorTy() && "ConvertVector destination IR type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("DstTy->isVectorTy() && \"ConvertVector destination IR type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1665, __PRETTY_FUNCTION__)); |
| 1666 | |
| 1667 | llvm::Type *SrcEltTy = SrcTy->getVectorElementType(), |
| 1668 | *DstEltTy = DstTy->getVectorElementType(); |
| 1669 | |
| 1670 | if (DstEltType->isBooleanType()) { |
| 1671 | assert((SrcEltTy->isFloatingPointTy() ||(((SrcEltTy->isFloatingPointTy() || isa<llvm::IntegerType >(SrcEltTy)) && "Unknown boolean conversion") ? static_cast <void> (0) : __assert_fail ("(SrcEltTy->isFloatingPointTy() || isa<llvm::IntegerType>(SrcEltTy)) && \"Unknown boolean conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1672, __PRETTY_FUNCTION__)) |
| 1672 | isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion")(((SrcEltTy->isFloatingPointTy() || isa<llvm::IntegerType >(SrcEltTy)) && "Unknown boolean conversion") ? static_cast <void> (0) : __assert_fail ("(SrcEltTy->isFloatingPointTy() || isa<llvm::IntegerType>(SrcEltTy)) && \"Unknown boolean conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1672, __PRETTY_FUNCTION__)); |
| 1673 | |
| 1674 | llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy); |
| 1675 | if (SrcEltTy->isFloatingPointTy()) { |
| 1676 | return Builder.CreateFCmpUNE(Src, Zero, "tobool"); |
| 1677 | } else { |
| 1678 | return Builder.CreateICmpNE(Src, Zero, "tobool"); |
| 1679 | } |
| 1680 | } |
| 1681 | |
| 1682 | // We have the arithmetic types: real int/float. |
| 1683 | Value *Res = nullptr; |
| 1684 | |
| 1685 | if (isa<llvm::IntegerType>(SrcEltTy)) { |
| 1686 | bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType(); |
| 1687 | if (isa<llvm::IntegerType>(DstEltTy)) |
| 1688 | Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv"); |
| 1689 | else if (InputSigned) |
| 1690 | Res = Builder.CreateSIToFP(Src, DstTy, "conv"); |
| 1691 | else |
| 1692 | Res = Builder.CreateUIToFP(Src, DstTy, "conv"); |
| 1693 | } else if (isa<llvm::IntegerType>(DstEltTy)) { |
| 1694 | assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion")((SrcEltTy->isFloatingPointTy() && "Unknown real conversion" ) ? static_cast<void> (0) : __assert_fail ("SrcEltTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1694, __PRETTY_FUNCTION__)); |
| 1695 | if (DstEltType->isSignedIntegerOrEnumerationType()) |
| 1696 | Res = Builder.CreateFPToSI(Src, DstTy, "conv"); |
| 1697 | else |
| 1698 | Res = Builder.CreateFPToUI(Src, DstTy, "conv"); |
| 1699 | } else { |
| 1700 | assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&((SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy () && "Unknown real conversion") ? static_cast<void > (0) : __assert_fail ("SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1701, __PRETTY_FUNCTION__)) |
| 1701 | "Unknown real conversion")((SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy () && "Unknown real conversion") ? static_cast<void > (0) : __assert_fail ("SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1701, __PRETTY_FUNCTION__)); |
| 1702 | if (DstEltTy->getTypeID() < SrcEltTy->getTypeID()) |
| 1703 | Res = Builder.CreateFPTrunc(Src, DstTy, "conv"); |
| 1704 | else |
| 1705 | Res = Builder.CreateFPExt(Src, DstTy, "conv"); |
| 1706 | } |
| 1707 | |
| 1708 | return Res; |
| 1709 | } |
| 1710 | |
| 1711 | Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) { |
| 1712 | if (CodeGenFunction::ConstantEmission Constant = CGF.tryEmitAsConstant(E)) { |
| 1713 | CGF.EmitIgnoredExpr(E->getBase()); |
| 1714 | return CGF.emitScalarConstant(Constant, E); |
| 1715 | } else { |
| 1716 | Expr::EvalResult Result; |
| 1717 | if (E->EvaluateAsInt(Result, CGF.getContext(), Expr::SE_AllowSideEffects)) { |
| 1718 | llvm::APSInt Value = Result.Val.getInt(); |
| 1719 | CGF.EmitIgnoredExpr(E->getBase()); |
| 1720 | return Builder.getInt(Value); |
| 1721 | } |
| 1722 | } |
| 1723 | |
| 1724 | return EmitLoadOfLValue(E); |
| 1725 | } |
| 1726 | |
| 1727 | Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) { |
| 1728 | TestAndClearIgnoreResultAssign(); |
| 1729 | |
| 1730 | // Emit subscript expressions in rvalue context's. For most cases, this just |
| 1731 | // loads the lvalue formed by the subscript expr. However, we have to be |
| 1732 | // careful, because the base of a vector subscript is occasionally an rvalue, |
| 1733 | // so we can't get it as an lvalue. |
| 1734 | if (!E->getBase()->getType()->isVectorType()) |
| 1735 | return EmitLoadOfLValue(E); |
| 1736 | |
| 1737 | // Handle the vector case. The base must be a vector, the index must be an |
| 1738 | // integer value. |
| 1739 | Value *Base = Visit(E->getBase()); |
| 1740 | Value *Idx = Visit(E->getIdx()); |
| 1741 | QualType IdxTy = E->getIdx()->getType(); |
| 1742 | |
| 1743 | if (CGF.SanOpts.has(SanitizerKind::ArrayBounds)) |
| 1744 | CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true); |
| 1745 | |
| 1746 | return Builder.CreateExtractElement(Base, Idx, "vecext"); |
| 1747 | } |
| 1748 | |
| 1749 | static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx, |
| 1750 | unsigned Off, llvm::Type *I32Ty) { |
| 1751 | int MV = SVI->getMaskValue(Idx); |
| 1752 | if (MV == -1) |
| 1753 | return llvm::UndefValue::get(I32Ty); |
| 1754 | return llvm::ConstantInt::get(I32Ty, Off+MV); |
| 1755 | } |
| 1756 | |
| 1757 | static llvm::Constant *getAsInt32(llvm::ConstantInt *C, llvm::Type *I32Ty) { |
| 1758 | if (C->getBitWidth() != 32) { |
| 1759 | assert(llvm::ConstantInt::isValueValidForType(I32Ty,((llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue ()) && "Index operand too large for shufflevector mask!" ) ? static_cast<void> (0) : __assert_fail ("llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue()) && \"Index operand too large for shufflevector mask!\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1761, __PRETTY_FUNCTION__)) |
| 1760 | C->getZExtValue()) &&((llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue ()) && "Index operand too large for shufflevector mask!" ) ? static_cast<void> (0) : __assert_fail ("llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue()) && \"Index operand too large for shufflevector mask!\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1761, __PRETTY_FUNCTION__)) |
| 1761 | "Index operand too large for shufflevector mask!")((llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue ()) && "Index operand too large for shufflevector mask!" ) ? static_cast<void> (0) : __assert_fail ("llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue()) && \"Index operand too large for shufflevector mask!\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1761, __PRETTY_FUNCTION__)); |
| 1762 | return llvm::ConstantInt::get(I32Ty, C->getZExtValue()); |
| 1763 | } |
| 1764 | return C; |
| 1765 | } |
| 1766 | |
| 1767 | Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) { |
| 1768 | bool Ignore = TestAndClearIgnoreResultAssign(); |
| 1769 | (void)Ignore; |
| 1770 | assert (Ignore == false && "init list ignored")((Ignore == false && "init list ignored") ? static_cast <void> (0) : __assert_fail ("Ignore == false && \"init list ignored\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1770, __PRETTY_FUNCTION__)); |
| 1771 | unsigned NumInitElements = E->getNumInits(); |
| 1772 | |
| 1773 | if (E->hadArrayRangeDesignator()) |
| 1774 | CGF.ErrorUnsupported(E, "GNU array range designator extension"); |
| 1775 | |
| 1776 | llvm::VectorType *VType = |
| 1777 | dyn_cast<llvm::VectorType>(ConvertType(E->getType())); |
| 1778 | |
| 1779 | if (!VType) { |
| 1780 | if (NumInitElements == 0) { |
| 1781 | // C++11 value-initialization for the scalar. |
| 1782 | return EmitNullValue(E->getType()); |
| 1783 | } |
| 1784 | // We have a scalar in braces. Just use the first element. |
| 1785 | return Visit(E->getInit(0)); |
| 1786 | } |
| 1787 | |
| 1788 | unsigned ResElts = VType->getNumElements(); |
| 1789 | |
| 1790 | // Loop over initializers collecting the Value for each, and remembering |
| 1791 | // whether the source was swizzle (ExtVectorElementExpr). This will allow |
| 1792 | // us to fold the shuffle for the swizzle into the shuffle for the vector |
| 1793 | // initializer, since LLVM optimizers generally do not want to touch |
| 1794 | // shuffles. |
| 1795 | unsigned CurIdx = 0; |
| 1796 | bool VIsUndefShuffle = false; |
| 1797 | llvm::Value *V = llvm::UndefValue::get(VType); |
| 1798 | for (unsigned i = 0; i != NumInitElements; ++i) { |
| 1799 | Expr *IE = E->getInit(i); |
| 1800 | Value *Init = Visit(IE); |
| 1801 | SmallVector<llvm::Constant*, 16> Args; |
| 1802 | |
| 1803 | llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType()); |
| 1804 | |
| 1805 | // Handle scalar elements. If the scalar initializer is actually one |
| 1806 | // element of a different vector of the same width, use shuffle instead of |
| 1807 | // extract+insert. |
| 1808 | if (!VVT) { |
| 1809 | if (isa<ExtVectorElementExpr>(IE)) { |
| 1810 | llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init); |
| 1811 | |
| 1812 | if (EI->getVectorOperandType()->getNumElements() == ResElts) { |
| 1813 | llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand()); |
| 1814 | Value *LHS = nullptr, *RHS = nullptr; |
| 1815 | if (CurIdx == 0) { |
| 1816 | // insert into undef -> shuffle (src, undef) |
| 1817 | // shufflemask must use an i32 |
| 1818 | Args.push_back(getAsInt32(C, CGF.Int32Ty)); |
| 1819 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); |
| 1820 | |
| 1821 | LHS = EI->getVectorOperand(); |
| 1822 | RHS = V; |
| 1823 | VIsUndefShuffle = true; |
| 1824 | } else if (VIsUndefShuffle) { |
| 1825 | // insert into undefshuffle && size match -> shuffle (v, src) |
| 1826 | llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V); |
| 1827 | for (unsigned j = 0; j != CurIdx; ++j) |
| 1828 | Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty)); |
| 1829 | Args.push_back(Builder.getInt32(ResElts + C->getZExtValue())); |
| 1830 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); |
| 1831 | |
| 1832 | LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0); |
| 1833 | RHS = EI->getVectorOperand(); |
| 1834 | VIsUndefShuffle = false; |
| 1835 | } |
| 1836 | if (!Args.empty()) { |
| 1837 | llvm::Constant *Mask = llvm::ConstantVector::get(Args); |
| 1838 | V = Builder.CreateShuffleVector(LHS, RHS, Mask); |
| 1839 | ++CurIdx; |
| 1840 | continue; |
| 1841 | } |
| 1842 | } |
| 1843 | } |
| 1844 | V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx), |
| 1845 | "vecinit"); |
| 1846 | VIsUndefShuffle = false; |
| 1847 | ++CurIdx; |
| 1848 | continue; |
| 1849 | } |
| 1850 | |
| 1851 | unsigned InitElts = VVT->getNumElements(); |
| 1852 | |
| 1853 | // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's |
| 1854 | // input is the same width as the vector being constructed, generate an |
| 1855 | // optimized shuffle of the swizzle input into the result. |
| 1856 | unsigned Offset = (CurIdx == 0) ? 0 : ResElts; |
| 1857 | if (isa<ExtVectorElementExpr>(IE)) { |
| 1858 | llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init); |
| 1859 | Value *SVOp = SVI->getOperand(0); |
| 1860 | llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType()); |
| 1861 | |
| 1862 | if (OpTy->getNumElements() == ResElts) { |
| 1863 | for (unsigned j = 0; j != CurIdx; ++j) { |
| 1864 | // If the current vector initializer is a shuffle with undef, merge |
| 1865 | // this shuffle directly into it. |
| 1866 | if (VIsUndefShuffle) { |
| 1867 | Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0, |
| 1868 | CGF.Int32Ty)); |
| 1869 | } else { |
| 1870 | Args.push_back(Builder.getInt32(j)); |
| 1871 | } |
| 1872 | } |
| 1873 | for (unsigned j = 0, je = InitElts; j != je; ++j) |
| 1874 | Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty)); |
| 1875 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); |
| 1876 | |
| 1877 | if (VIsUndefShuffle) |
| 1878 | V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0); |
| 1879 | |
| 1880 | Init = SVOp; |
| 1881 | } |
| 1882 | } |
| 1883 | |
| 1884 | // Extend init to result vector length, and then shuffle its contribution |
| 1885 | // to the vector initializer into V. |
| 1886 | if (Args.empty()) { |
| 1887 | for (unsigned j = 0; j != InitElts; ++j) |
| 1888 | Args.push_back(Builder.getInt32(j)); |
| 1889 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); |
| 1890 | llvm::Constant *Mask = llvm::ConstantVector::get(Args); |
| 1891 | Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT), |
| 1892 | Mask, "vext"); |
| 1893 | |
| 1894 | Args.clear(); |
| 1895 | for (unsigned j = 0; j != CurIdx; ++j) |
| 1896 | Args.push_back(Builder.getInt32(j)); |
| 1897 | for (unsigned j = 0; j != InitElts; ++j) |
| 1898 | Args.push_back(Builder.getInt32(j+Offset)); |
| 1899 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); |
| 1900 | } |
| 1901 | |
| 1902 | // If V is undef, make sure it ends up on the RHS of the shuffle to aid |
| 1903 | // merging subsequent shuffles into this one. |
| 1904 | if (CurIdx == 0) |
| 1905 | std::swap(V, Init); |
| 1906 | llvm::Constant *Mask = llvm::ConstantVector::get(Args); |
| 1907 | V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit"); |
| 1908 | VIsUndefShuffle = isa<llvm::UndefValue>(Init); |
| 1909 | CurIdx += InitElts; |
| 1910 | } |
| 1911 | |
| 1912 | // FIXME: evaluate codegen vs. shuffling against constant null vector. |
| 1913 | // Emit remaining default initializers. |
| 1914 | llvm::Type *EltTy = VType->getElementType(); |
| 1915 | |
| 1916 | // Emit remaining default initializers |
| 1917 | for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) { |
| 1918 | Value *Idx = Builder.getInt32(CurIdx); |
| 1919 | llvm::Value *Init = llvm::Constant::getNullValue(EltTy); |
| 1920 | V = Builder.CreateInsertElement(V, Init, Idx, "vecinit"); |
| 1921 | } |
| 1922 | return V; |
| 1923 | } |
| 1924 | |
| 1925 | bool CodeGenFunction::ShouldNullCheckClassCastValue(const CastExpr *CE) { |
| 1926 | const Expr *E = CE->getSubExpr(); |
| 1927 | |
| 1928 | if (CE->getCastKind() == CK_UncheckedDerivedToBase) |
| 1929 | return false; |
| 1930 | |
| 1931 | if (isa<CXXThisExpr>(E->IgnoreParens())) { |
| 1932 | // We always assume that 'this' is never null. |
| 1933 | return false; |
| 1934 | } |
| 1935 | |
| 1936 | if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) { |
| 1937 | // And that glvalue casts are never null. |
| 1938 | if (ICE->getValueKind() != VK_RValue) |
| 1939 | return false; |
| 1940 | } |
| 1941 | |
| 1942 | return true; |
| 1943 | } |
| 1944 | |
| 1945 | // VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts |
| 1946 | // have to handle a more broad range of conversions than explicit casts, as they |
| 1947 | // handle things like function to ptr-to-function decay etc. |
| 1948 | Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) { |
| 1949 | Expr *E = CE->getSubExpr(); |
| 1950 | QualType DestTy = CE->getType(); |
| 1951 | CastKind Kind = CE->getCastKind(); |
| 1952 | |
| 1953 | // These cases are generally not written to ignore the result of |
| 1954 | // evaluating their sub-expressions, so we clear this now. |
| 1955 | bool Ignored = TestAndClearIgnoreResultAssign(); |
| 1956 | |
| 1957 | // Since almost all cast kinds apply to scalars, this switch doesn't have |
| 1958 | // a default case, so the compiler will warn on a missing case. The cases |
| 1959 | // are in the same order as in the CastKind enum. |
| 1960 | switch (Kind) { |
| 1961 | case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!")::llvm::llvm_unreachable_internal("dependent cast kind in IR gen!" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1961); |
| 1962 | case CK_BuiltinFnToFnPtr: |
| 1963 | llvm_unreachable("builtin functions are handled elsewhere")::llvm::llvm_unreachable_internal("builtin functions are handled elsewhere" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1963); |
| 1964 | |
| 1965 | case CK_LValueBitCast: |
| 1966 | case CK_ObjCObjectLValueCast: { |
| 1967 | Address Addr = EmitLValue(E).getAddress(); |
| 1968 | Addr = Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(DestTy)); |
| 1969 | LValue LV = CGF.MakeAddrLValue(Addr, DestTy); |
| 1970 | return EmitLoadOfLValue(LV, CE->getExprLoc()); |
| 1971 | } |
| 1972 | |
| 1973 | case CK_LValueToRValueBitCast: { |
| 1974 | LValue SourceLVal = CGF.EmitLValue(E); |
| 1975 | Address Addr = Builder.CreateElementBitCast(SourceLVal.getAddress(), |
| 1976 | CGF.ConvertTypeForMem(DestTy)); |
| 1977 | LValue DestLV = CGF.MakeAddrLValue(Addr, DestTy); |
| 1978 | DestLV.setTBAAInfo(TBAAAccessInfo::getMayAliasInfo()); |
| 1979 | return EmitLoadOfLValue(DestLV, CE->getExprLoc()); |
| 1980 | } |
| 1981 | |
| 1982 | case CK_CPointerToObjCPointerCast: |
| 1983 | case CK_BlockPointerToObjCPointerCast: |
| 1984 | case CK_AnyPointerToBlockPointerCast: |
| 1985 | case CK_BitCast: { |
| 1986 | Value *Src = Visit(const_cast<Expr*>(E)); |
| 1987 | llvm::Type *SrcTy = Src->getType(); |
| 1988 | llvm::Type *DstTy = ConvertType(DestTy); |
| 1989 | if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() && |
| 1990 | SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) { |
| 1991 | llvm_unreachable("wrong cast for pointers in different address spaces"::llvm::llvm_unreachable_internal("wrong cast for pointers in different address spaces" "(must be an address space cast)!", "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1992) |
| 1992 | "(must be an address space cast)!")::llvm::llvm_unreachable_internal("wrong cast for pointers in different address spaces" "(must be an address space cast)!", "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1992); |
| 1993 | } |
| 1994 | |
| 1995 | if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) { |
| 1996 | if (auto PT = DestTy->getAs<PointerType>()) |
| 1997 | CGF.EmitVTablePtrCheckForCast(PT->getPointeeType(), Src, |
| 1998 | /*MayBeNull=*/true, |
| 1999 | CodeGenFunction::CFITCK_UnrelatedCast, |
| 2000 | CE->getBeginLoc()); |
| 2001 | } |
| 2002 | |
| 2003 | if (CGF.CGM.getCodeGenOpts().StrictVTablePointers) { |
| 2004 | const QualType SrcType = E->getType(); |
| 2005 | |
| 2006 | if (SrcType.mayBeNotDynamicClass() && DestTy.mayBeDynamicClass()) { |
| 2007 | // Casting to pointer that could carry dynamic information (provided by |
| 2008 | // invariant.group) requires launder. |
| 2009 | Src = Builder.CreateLaunderInvariantGroup(Src); |
| 2010 | } else if (SrcType.mayBeDynamicClass() && DestTy.mayBeNotDynamicClass()) { |
| 2011 | // Casting to pointer that does not carry dynamic information (provided |
| 2012 | // by invariant.group) requires stripping it. Note that we don't do it |
| 2013 | // if the source could not be dynamic type and destination could be |
| 2014 | // dynamic because dynamic information is already laundered. It is |
| 2015 | // because launder(strip(src)) == launder(src), so there is no need to |
| 2016 | // add extra strip before launder. |
| 2017 | Src = Builder.CreateStripInvariantGroup(Src); |
| 2018 | } |
| 2019 | } |
| 2020 | |
| 2021 | // Update heapallocsite metadata when there is an explicit cast. |
| 2022 | if (llvm::CallInst *CI = dyn_cast<llvm::CallInst>(Src)) |
| 2023 | if (CI->getMetadata("heapallocsite") && isa<ExplicitCastExpr>(CE)) |
| 2024 | CGF.getDebugInfo()-> |
| 2025 | addHeapAllocSiteMetadata(CI, CE->getType(), CE->getExprLoc()); |
| 2026 | |
| 2027 | return Builder.CreateBitCast(Src, DstTy); |
| 2028 | } |
| 2029 | case CK_AddressSpaceConversion: { |
| 2030 | Expr::EvalResult Result; |
| 2031 | if (E->EvaluateAsRValue(Result, CGF.getContext()) && |
| 2032 | Result.Val.isNullPointer()) { |
| 2033 | // If E has side effect, it is emitted even if its final result is a |
| 2034 | // null pointer. In that case, a DCE pass should be able to |
| 2035 | // eliminate the useless instructions emitted during translating E. |
| 2036 | if (Result.HasSideEffects) |
| 2037 | Visit(E); |
| 2038 | return CGF.CGM.getNullPointer(cast<llvm::PointerType>( |
| 2039 | ConvertType(DestTy)), DestTy); |
| 2040 | } |
| 2041 | // Since target may map different address spaces in AST to the same address |
| 2042 | // space, an address space conversion may end up as a bitcast. |
| 2043 | return CGF.CGM.getTargetCodeGenInfo().performAddrSpaceCast( |
| 2044 | CGF, Visit(E), E->getType()->getPointeeType().getAddressSpace(), |
| 2045 | DestTy->getPointeeType().getAddressSpace(), ConvertType(DestTy)); |
| 2046 | } |
| 2047 | case CK_AtomicToNonAtomic: |
| 2048 | case CK_NonAtomicToAtomic: |
| 2049 | case CK_NoOp: |
| 2050 | case CK_UserDefinedConversion: |
| 2051 | return Visit(const_cast<Expr*>(E)); |
| 2052 | |
| 2053 | case CK_BaseToDerived: { |
| 2054 | const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl(); |
| 2055 | assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!")((DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!" ) ? static_cast<void> (0) : __assert_fail ("DerivedClassDecl && \"BaseToDerived arg isn't a C++ object pointer!\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2055, __PRETTY_FUNCTION__)); |
| 2056 | |
| 2057 | Address Base = CGF.EmitPointerWithAlignment(E); |
| 2058 | Address Derived = |
| 2059 | CGF.GetAddressOfDerivedClass(Base, DerivedClassDecl, |
| 2060 | CE->path_begin(), CE->path_end(), |
| 2061 | CGF.ShouldNullCheckClassCastValue(CE)); |
| 2062 | |
| 2063 | // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is |
| 2064 | // performed and the object is not of the derived type. |
| 2065 | if (CGF.sanitizePerformTypeCheck()) |
| 2066 | CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(), |
| 2067 | Derived.getPointer(), DestTy->getPointeeType()); |
| 2068 | |
| 2069 | if (CGF.SanOpts.has(SanitizerKind::CFIDerivedCast)) |
| 2070 | CGF.EmitVTablePtrCheckForCast( |
| 2071 | DestTy->getPointeeType(), Derived.getPointer(), |
| 2072 | /*MayBeNull=*/true, CodeGenFunction::CFITCK_DerivedCast, |
| 2073 | CE->getBeginLoc()); |
| 2074 | |
| 2075 | return Derived.getPointer(); |
| 2076 | } |
| 2077 | case CK_UncheckedDerivedToBase: |
| 2078 | case CK_DerivedToBase: { |
| 2079 | // The EmitPointerWithAlignment path does this fine; just discard |
| 2080 | // the alignment. |
| 2081 | return CGF.EmitPointerWithAlignment(CE).getPointer(); |
| 2082 | } |
| 2083 | |
| 2084 | case CK_Dynamic: { |
| 2085 | Address V = CGF.EmitPointerWithAlignment(E); |
| 2086 | const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE); |
| 2087 | return CGF.EmitDynamicCast(V, DCE); |
| 2088 | } |
| 2089 | |
| 2090 | case CK_ArrayToPointerDecay: |
| 2091 | return CGF.EmitArrayToPointerDecay(E).getPointer(); |
| 2092 | case CK_FunctionToPointerDecay: |
| 2093 | return EmitLValue(E).getPointer(); |
| 2094 | |
| 2095 | case CK_NullToPointer: |
| 2096 | if (MustVisitNullValue(E)) |
| 2097 | CGF.EmitIgnoredExpr(E); |
| 2098 | |
| 2099 | return CGF.CGM.getNullPointer(cast<llvm::PointerType>(ConvertType(DestTy)), |
| 2100 | DestTy); |
| 2101 | |
| 2102 | case CK_NullToMemberPointer: { |
| 2103 | if (MustVisitNullValue(E)) |
| 2104 | CGF.EmitIgnoredExpr(E); |
| 2105 | |
| 2106 | const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>(); |
| 2107 | return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT); |
| 2108 | } |
| 2109 | |
| 2110 | case CK_ReinterpretMemberPointer: |
| 2111 | case CK_BaseToDerivedMemberPointer: |
| 2112 | case CK_DerivedToBaseMemberPointer: { |
| 2113 | Value *Src = Visit(E); |
| 2114 | |
| 2115 | // Note that the AST doesn't distinguish between checked and |
| 2116 | // unchecked member pointer conversions, so we always have to |
| 2117 | // implement checked conversions here. This is inefficient when |
| 2118 | // actual control flow may be required in order to perform the |
| 2119 | // check, which it is for data member pointers (but not member |
| 2120 | // function pointers on Itanium and ARM). |
| 2121 | return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src); |
| 2122 | } |
| 2123 | |
| 2124 | case CK_ARCProduceObject: |
| 2125 | return CGF.EmitARCRetainScalarExpr(E); |
| 2126 | case CK_ARCConsumeObject: |
| 2127 | return CGF.EmitObjCConsumeObject(E->getType(), Visit(E)); |
| 2128 | case CK_ARCReclaimReturnedObject: |
| 2129 | return CGF.EmitARCReclaimReturnedObject(E, /*allowUnsafe*/ Ignored); |
| 2130 | case CK_ARCExtendBlockObject: |
| 2131 | return CGF.EmitARCExtendBlockObject(E); |
| 2132 | |
| 2133 | case CK_CopyAndAutoreleaseBlockObject: |
| 2134 | return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType()); |
| 2135 | |
| 2136 | case CK_FloatingRealToComplex: |
| 2137 | case CK_FloatingComplexCast: |
| 2138 | case CK_IntegralRealToComplex: |
| 2139 | case CK_IntegralComplexCast: |
| 2140 | case CK_IntegralComplexToFloatingComplex: |
| 2141 | case CK_FloatingComplexToIntegralComplex: |
| 2142 | case CK_ConstructorConversion: |
| 2143 | case CK_ToUnion: |
| 2144 | llvm_unreachable("scalar cast to non-scalar value")::llvm::llvm_unreachable_internal("scalar cast to non-scalar value" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2144); |
| 2145 | |
| 2146 | case CK_LValueToRValue: |
| 2147 | assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy))((CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy )) ? static_cast<void> (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy)" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2147, __PRETTY_FUNCTION__)); |
| 2148 | assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!")((E->isGLValue() && "lvalue-to-rvalue applied to r-value!" ) ? static_cast<void> (0) : __assert_fail ("E->isGLValue() && \"lvalue-to-rvalue applied to r-value!\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2148, __PRETTY_FUNCTION__)); |
| 2149 | return Visit(const_cast<Expr*>(E)); |
| 2150 | |
| 2151 | case CK_IntegralToPointer: { |
| 2152 | Value *Src = Visit(const_cast<Expr*>(E)); |
| 2153 | |
| 2154 | // First, convert to the correct width so that we control the kind of |
| 2155 | // extension. |
| 2156 | auto DestLLVMTy = ConvertType(DestTy); |
| 2157 | llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DestLLVMTy); |
| 2158 | bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType(); |
| 2159 | llvm::Value* IntResult = |
| 2160 | Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv"); |
| 2161 | |
| 2162 | auto *IntToPtr = Builder.CreateIntToPtr(IntResult, DestLLVMTy); |
| 2163 | |
| 2164 | if (CGF.CGM.getCodeGenOpts().StrictVTablePointers) { |
| 2165 | // Going from integer to pointer that could be dynamic requires reloading |
| 2166 | // dynamic information from invariant.group. |
| 2167 | if (DestTy.mayBeDynamicClass()) |
| 2168 | IntToPtr = Builder.CreateLaunderInvariantGroup(IntToPtr); |
| 2169 | } |
| 2170 | return IntToPtr; |
| 2171 | } |
| 2172 | case CK_PointerToIntegral: { |
| 2173 | assert(!DestTy->isBooleanType() && "bool should use PointerToBool")((!DestTy->isBooleanType() && "bool should use PointerToBool" ) ? static_cast<void> (0) : __assert_fail ("!DestTy->isBooleanType() && \"bool should use PointerToBool\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2173, __PRETTY_FUNCTION__)); |
| 2174 | auto *PtrExpr = Visit(E); |
| 2175 | |
| 2176 | if (CGF.CGM.getCodeGenOpts().StrictVTablePointers) { |
| 2177 | const QualType SrcType = E->getType(); |
| 2178 | |
| 2179 | // Casting to integer requires stripping dynamic information as it does |
| 2180 | // not carries it. |
| 2181 | if (SrcType.mayBeDynamicClass()) |
| 2182 | PtrExpr = Builder.CreateStripInvariantGroup(PtrExpr); |
| 2183 | } |
| 2184 | |
| 2185 | return Builder.CreatePtrToInt(PtrExpr, ConvertType(DestTy)); |
| 2186 | } |
| 2187 | case CK_ToVoid: { |
| 2188 | CGF.EmitIgnoredExpr(E); |
| 2189 | return nullptr; |
| 2190 | } |
| 2191 | case CK_VectorSplat: { |
| 2192 | llvm::Type *DstTy = ConvertType(DestTy); |
| 2193 | Value *Elt = Visit(const_cast<Expr*>(E)); |
| 2194 | // Splat the element across to all elements |
| 2195 | unsigned NumElements = DstTy->getVectorNumElements(); |
| 2196 | return Builder.CreateVectorSplat(NumElements, Elt, "splat"); |
| 2197 | } |
| 2198 | |
| 2199 | case CK_FixedPointCast: |
| 2200 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, |
| 2201 | CE->getExprLoc()); |
| 2202 | |
| 2203 | case CK_FixedPointToBoolean: |
| 2204 | assert(E->getType()->isFixedPointType() &&((E->getType()->isFixedPointType() && "Expected src type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Expected src type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2205, __PRETTY_FUNCTION__)) |
| 2205 | "Expected src type to be fixed point type")((E->getType()->isFixedPointType() && "Expected src type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Expected src type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2205, __PRETTY_FUNCTION__)); |
| 2206 | assert(DestTy->isBooleanType() && "Expected dest type to be boolean type")((DestTy->isBooleanType() && "Expected dest type to be boolean type" ) ? static_cast<void> (0) : __assert_fail ("DestTy->isBooleanType() && \"Expected dest type to be boolean type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2206, __PRETTY_FUNCTION__)); |
| 2207 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, |
| 2208 | CE->getExprLoc()); |
| 2209 | |
| 2210 | case CK_FixedPointToIntegral: |
| 2211 | assert(E->getType()->isFixedPointType() &&((E->getType()->isFixedPointType() && "Expected src type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Expected src type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2212, __PRETTY_FUNCTION__)) |
| 2212 | "Expected src type to be fixed point type")((E->getType()->isFixedPointType() && "Expected src type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Expected src type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2212, __PRETTY_FUNCTION__)); |
| 2213 | assert(DestTy->isIntegerType() && "Expected dest type to be an integer")((DestTy->isIntegerType() && "Expected dest type to be an integer" ) ? static_cast<void> (0) : __assert_fail ("DestTy->isIntegerType() && \"Expected dest type to be an integer\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2213, __PRETTY_FUNCTION__)); |
| 2214 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, |
| 2215 | CE->getExprLoc()); |
| 2216 | |
| 2217 | case CK_IntegralToFixedPoint: |
| 2218 | assert(E->getType()->isIntegerType() &&((E->getType()->isIntegerType() && "Expected src type to be an integer" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegerType() && \"Expected src type to be an integer\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2219, __PRETTY_FUNCTION__)) |
| 2219 | "Expected src type to be an integer")((E->getType()->isIntegerType() && "Expected src type to be an integer" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegerType() && \"Expected src type to be an integer\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2219, __PRETTY_FUNCTION__)); |
| 2220 | assert(DestTy->isFixedPointType() &&((DestTy->isFixedPointType() && "Expected dest type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("DestTy->isFixedPointType() && \"Expected dest type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2221, __PRETTY_FUNCTION__)) |
| 2221 | "Expected dest type to be fixed point type")((DestTy->isFixedPointType() && "Expected dest type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("DestTy->isFixedPointType() && \"Expected dest type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2221, __PRETTY_FUNCTION__)); |
| 2222 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, |
| 2223 | CE->getExprLoc()); |
| 2224 | |
| 2225 | case CK_IntegralCast: { |
| 2226 | ScalarConversionOpts Opts; |
| 2227 | if (auto *ICE = dyn_cast<ImplicitCastExpr>(CE)) { |
| 2228 | if (!ICE->isPartOfExplicitCast()) |
| 2229 | Opts = ScalarConversionOpts(CGF.SanOpts); |
| 2230 | } |
| 2231 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, |
| 2232 | CE->getExprLoc(), Opts); |
| 2233 | } |
| 2234 | case CK_IntegralToFloating: |
| 2235 | case CK_FloatingToIntegral: |
| 2236 | case CK_FloatingCast: |
| 2237 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, |
| 2238 | CE->getExprLoc()); |
| 2239 | case CK_BooleanToSignedIntegral: { |
| 2240 | ScalarConversionOpts Opts; |
| 2241 | Opts.TreatBooleanAsSigned = true; |
| 2242 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, |
| 2243 | CE->getExprLoc(), Opts); |
| 2244 | } |
| 2245 | case CK_IntegralToBoolean: |
| 2246 | return EmitIntToBoolConversion(Visit(E)); |
| 2247 | case CK_PointerToBoolean: |
| 2248 | return EmitPointerToBoolConversion(Visit(E), E->getType()); |
| 2249 | case CK_FloatingToBoolean: |
| 2250 | return EmitFloatToBoolConversion(Visit(E)); |
| 2251 | case CK_MemberPointerToBoolean: { |
| 2252 | llvm::Value *MemPtr = Visit(E); |
| 2253 | const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>(); |
| 2254 | return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT); |
| 2255 | } |
| 2256 | |
| 2257 | case CK_FloatingComplexToReal: |
| 2258 | case CK_IntegralComplexToReal: |
| 2259 | return CGF.EmitComplexExpr(E, false, true).first; |
| 2260 | |
| 2261 | case CK_FloatingComplexToBoolean: |
| 2262 | case CK_IntegralComplexToBoolean: { |
| 2263 | CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E); |
| 2264 | |
| 2265 | // TODO: kill this function off, inline appropriate case here |
| 2266 | return EmitComplexToScalarConversion(V, E->getType(), DestTy, |
| 2267 | CE->getExprLoc()); |
| 2268 | } |
| 2269 | |
| 2270 | case CK_ZeroToOCLOpaqueType: { |
| 2271 | assert((DestTy->isEventT() || DestTy->isQueueT() ||(((DestTy->isEventT() || DestTy->isQueueT() || DestTy-> isOCLIntelSubgroupAVCType()) && "CK_ZeroToOCLEvent cast on non-event type" ) ? static_cast<void> (0) : __assert_fail ("(DestTy->isEventT() || DestTy->isQueueT() || DestTy->isOCLIntelSubgroupAVCType()) && \"CK_ZeroToOCLEvent cast on non-event type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2273, __PRETTY_FUNCTION__)) |
| 2272 | DestTy->isOCLIntelSubgroupAVCType()) &&(((DestTy->isEventT() || DestTy->isQueueT() || DestTy-> isOCLIntelSubgroupAVCType()) && "CK_ZeroToOCLEvent cast on non-event type" ) ? static_cast<void> (0) : __assert_fail ("(DestTy->isEventT() || DestTy->isQueueT() || DestTy->isOCLIntelSubgroupAVCType()) && \"CK_ZeroToOCLEvent cast on non-event type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2273, __PRETTY_FUNCTION__)) |
| 2273 | "CK_ZeroToOCLEvent cast on non-event type")(((DestTy->isEventT() || DestTy->isQueueT() || DestTy-> isOCLIntelSubgroupAVCType()) && "CK_ZeroToOCLEvent cast on non-event type" ) ? static_cast<void> (0) : __assert_fail ("(DestTy->isEventT() || DestTy->isQueueT() || DestTy->isOCLIntelSubgroupAVCType()) && \"CK_ZeroToOCLEvent cast on non-event type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2273, __PRETTY_FUNCTION__)); |
| 2274 | return llvm::Constant::getNullValue(ConvertType(DestTy)); |
| 2275 | } |
| 2276 | |
| 2277 | case CK_IntToOCLSampler: |
| 2278 | return CGF.CGM.createOpenCLIntToSamplerConversion(E, CGF); |
| 2279 | |
| 2280 | } // end of switch |
| 2281 | |
| 2282 | llvm_unreachable("unknown scalar cast")::llvm::llvm_unreachable_internal("unknown scalar cast", "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2282); |
| 2283 | } |
| 2284 | |
| 2285 | Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) { |
| 2286 | CodeGenFunction::StmtExprEvaluation eval(CGF); |
| 2287 | Address RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(), |
| 2288 | !E->getType()->isVoidType()); |
| 2289 | if (!RetAlloca.isValid()) |
| 2290 | return nullptr; |
| 2291 | return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()), |
| 2292 | E->getExprLoc()); |
| 2293 | } |
| 2294 | |
| 2295 | Value *ScalarExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) { |
| 2296 | CGF.enterFullExpression(E); |
| 2297 | CodeGenFunction::RunCleanupsScope Scope(CGF); |
| 2298 | Value *V = Visit(E->getSubExpr()); |
| 2299 | // Defend against dominance problems caused by jumps out of expression |
| 2300 | // evaluation through the shared cleanup block. |
| 2301 | Scope.ForceCleanup({&V}); |
| 2302 | return V; |
| 2303 | } |
| 2304 | |
| 2305 | //===----------------------------------------------------------------------===// |
| 2306 | // Unary Operators |
| 2307 | //===----------------------------------------------------------------------===// |
| 2308 | |
| 2309 | static BinOpInfo createBinOpInfoFromIncDec(const UnaryOperator *E, |
| 2310 | llvm::Value *InVal, bool IsInc) { |
| 2311 | BinOpInfo BinOp; |
| 2312 | BinOp.LHS = InVal; |
| 2313 | BinOp.RHS = llvm::ConstantInt::get(InVal->getType(), 1, false); |
| 2314 | BinOp.Ty = E->getType(); |
| 2315 | BinOp.Opcode = IsInc ? BO_Add : BO_Sub; |
| 2316 | // FIXME: once UnaryOperator carries FPFeatures, copy it here. |
| 2317 | BinOp.E = E; |
| 2318 | return BinOp; |
| 2319 | } |
| 2320 | |
| 2321 | llvm::Value *ScalarExprEmitter::EmitIncDecConsiderOverflowBehavior( |
| 2322 | const UnaryOperator *E, llvm::Value *InVal, bool IsInc) { |
| 2323 | llvm::Value *Amount = |
| 2324 | llvm::ConstantInt::get(InVal->getType(), IsInc ? 1 : -1, true); |
| 2325 | StringRef Name = IsInc ? "inc" : "dec"; |
| 2326 | switch (CGF.getLangOpts().getSignedOverflowBehavior()) { |
| 2327 | case LangOptions::SOB_Defined: |
| 2328 | return Builder.CreateAdd(InVal, Amount, Name); |
| 2329 | case LangOptions::SOB_Undefined: |
| 2330 | if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) |
| 2331 | return Builder.CreateNSWAdd(InVal, Amount, Name); |
| 2332 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
| 2333 | case LangOptions::SOB_Trapping: |
| 2334 | if (!E->canOverflow()) |
| 2335 | return Builder.CreateNSWAdd(InVal, Amount, Name); |
| 2336 | return EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, InVal, IsInc)); |
| 2337 | } |
| 2338 | llvm_unreachable("Unknown SignedOverflowBehaviorTy")::llvm::llvm_unreachable_internal("Unknown SignedOverflowBehaviorTy" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2338); |
| 2339 | } |
| 2340 | |
| 2341 | llvm::Value * |
| 2342 | ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV, |
| 2343 | bool isInc, bool isPre) { |
| 2344 | |
| 2345 | QualType type = E->getSubExpr()->getType(); |
| 2346 | llvm::PHINode *atomicPHI = nullptr; |
| 2347 | llvm::Value *value; |
| 2348 | llvm::Value *input; |
| 2349 | |
| 2350 | int amount = (isInc ? 1 : -1); |
| 2351 | bool isSubtraction = !isInc; |
| 2352 | |
| 2353 | if (const AtomicType *atomicTy = type->getAs<AtomicType>()) { |
| 2354 | type = atomicTy->getValueType(); |
| 2355 | if (isInc && type->isBooleanType()) { |
| 2356 | llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type); |
| 2357 | if (isPre) { |
| 2358 | Builder.CreateStore(True, LV.getAddress(), LV.isVolatileQualified()) |
| 2359 | ->setAtomic(llvm::AtomicOrdering::SequentiallyConsistent); |
| 2360 | return Builder.getTrue(); |
| 2361 | } |
| 2362 | // For atomic bool increment, we just store true and return it for |
| 2363 | // preincrement, do an atomic swap with true for postincrement |
| 2364 | return Builder.CreateAtomicRMW( |
| 2365 | llvm::AtomicRMWInst::Xchg, LV.getPointer(), True, |
| 2366 | llvm::AtomicOrdering::SequentiallyConsistent); |
| 2367 | } |
| 2368 | // Special case for atomic increment / decrement on integers, emit |
| 2369 | // atomicrmw instructions. We skip this if we want to be doing overflow |
| 2370 | // checking, and fall into the slow path with the atomic cmpxchg loop. |
| 2371 | if (!type->isBooleanType() && type->isIntegerType() && |
| 2372 | !(type->isUnsignedIntegerType() && |
| 2373 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) && |
| 2374 | CGF.getLangOpts().getSignedOverflowBehavior() != |
| 2375 | LangOptions::SOB_Trapping) { |
| 2376 | llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add : |
| 2377 | llvm::AtomicRMWInst::Sub; |
| 2378 | llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add : |
| 2379 | llvm::Instruction::Sub; |
| 2380 | llvm::Value *amt = CGF.EmitToMemory( |
| 2381 | llvm::ConstantInt::get(ConvertType(type), 1, true), type); |
| 2382 | llvm::Value *old = Builder.CreateAtomicRMW(aop, |
| 2383 | LV.getPointer(), amt, llvm::AtomicOrdering::SequentiallyConsistent); |
| 2384 | return isPre ? Builder.CreateBinOp(op, old, amt) : old; |
| 2385 | } |
| 2386 | value = EmitLoadOfLValue(LV, E->getExprLoc()); |
| 2387 | input = value; |
| 2388 | // For every other atomic operation, we need to emit a load-op-cmpxchg loop |
| 2389 | llvm::BasicBlock *startBB = Builder.GetInsertBlock(); |
| 2390 | llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn); |
| 2391 | value = CGF.EmitToMemory(value, type); |
| 2392 | Builder.CreateBr(opBB); |
| 2393 | Builder.SetInsertPoint(opBB); |
| 2394 | atomicPHI = Builder.CreatePHI(value->getType(), 2); |
| 2395 | atomicPHI->addIncoming(value, startBB); |
| 2396 | value = atomicPHI; |
| 2397 | } else { |
| 2398 | value = EmitLoadOfLValue(LV, E->getExprLoc()); |
| 2399 | input = value; |
| 2400 | } |
| 2401 | |
| 2402 | // Special case of integer increment that we have to check first: bool++. |
| 2403 | // Due to promotion rules, we get: |
| 2404 | // bool++ -> bool = bool + 1 |
| 2405 | // -> bool = (int)bool + 1 |
| 2406 | // -> bool = ((int)bool + 1 != 0) |
| 2407 | // An interesting aspect of this is that increment is always true. |
| 2408 | // Decrement does not have this property. |
| 2409 | if (isInc && type->isBooleanType()) { |
| 2410 | value = Builder.getTrue(); |
| 2411 | |
| 2412 | // Most common case by far: integer increment. |
| 2413 | } else if (type->isIntegerType()) { |
| 2414 | // Note that signed integer inc/dec with width less than int can't |
| 2415 | // overflow because of promotion rules; we're just eliding a few steps here. |
| 2416 | if (E->canOverflow() && type->isSignedIntegerOrEnumerationType()) { |
| 2417 | value = EmitIncDecConsiderOverflowBehavior(E, value, isInc); |
| 2418 | } else if (E->canOverflow() && type->isUnsignedIntegerType() && |
| 2419 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) { |
| 2420 | value = |
| 2421 | EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, value, isInc)); |
| 2422 | } else { |
| 2423 | llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true); |
| 2424 | value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec"); |
| 2425 | } |
| 2426 | |
| 2427 | // Next most common: pointer increment. |
| 2428 | } else if (const PointerType *ptr = type->getAs<PointerType>()) { |
| 2429 | QualType type = ptr->getPointeeType(); |
| 2430 | |
| 2431 | // VLA types don't have constant size. |
| 2432 | if (const VariableArrayType *vla |
| 2433 | = CGF.getContext().getAsVariableArrayType(type)) { |
| 2434 | llvm::Value *numElts = CGF.getVLASize(vla).NumElts; |
| 2435 | if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize"); |
| 2436 | if (CGF.getLangOpts().isSignedOverflowDefined()) |
| 2437 | value = Builder.CreateGEP(value, numElts, "vla.inc"); |
| 2438 | else |
| 2439 | value = CGF.EmitCheckedInBoundsGEP( |
| 2440 | value, numElts, /*SignedIndices=*/false, isSubtraction, |
| 2441 | E->getExprLoc(), "vla.inc"); |
| 2442 | |
| 2443 | // Arithmetic on function pointers (!) is just +-1. |
| 2444 | } else if (type->isFunctionType()) { |
| 2445 | llvm::Value *amt = Builder.getInt32(amount); |
| 2446 | |
| 2447 | value = CGF.EmitCastToVoidPtr(value); |
| 2448 | if (CGF.getLangOpts().isSignedOverflowDefined()) |
| 2449 | value = Builder.CreateGEP(value, amt, "incdec.funcptr"); |
| 2450 | else |
| 2451 | value = CGF.EmitCheckedInBoundsGEP(value, amt, /*SignedIndices=*/false, |
| 2452 | isSubtraction, E->getExprLoc(), |
| 2453 | "incdec.funcptr"); |
| 2454 | value = Builder.CreateBitCast(value, input->getType()); |
| 2455 | |
| 2456 | // For everything else, we can just do a simple increment. |
| 2457 | } else { |
| 2458 | llvm::Value *amt = Builder.getInt32(amount); |
| 2459 | if (CGF.getLangOpts().isSignedOverflowDefined()) |
| 2460 | value = Builder.CreateGEP(value, amt, "incdec.ptr"); |
| 2461 | else |
| 2462 | value = CGF.EmitCheckedInBoundsGEP(value, amt, /*SignedIndices=*/false, |
| 2463 | isSubtraction, E->getExprLoc(), |
| 2464 | "incdec.ptr"); |
| 2465 | } |
| 2466 | |
| 2467 | // Vector increment/decrement. |
| 2468 | } else if (type->isVectorType()) { |
| 2469 | if (type->hasIntegerRepresentation()) { |
| 2470 | llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount); |
| 2471 | |
| 2472 | value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec"); |
| 2473 | } else { |
| 2474 | value = Builder.CreateFAdd( |
| 2475 | value, |
| 2476 | llvm::ConstantFP::get(value->getType(), amount), |
| 2477 | isInc ? "inc" : "dec"); |
| 2478 | } |
| 2479 | |
| 2480 | // Floating point. |
| 2481 | } else if (type->isRealFloatingType()) { |
| 2482 | // Add the inc/dec to the real part. |
| 2483 | llvm::Value *amt; |
| 2484 | |
| 2485 | if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) { |
| 2486 | // Another special case: half FP increment should be done via float |
| 2487 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) { |
| 2488 | value = Builder.CreateCall( |
| 2489 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, |
| 2490 | CGF.CGM.FloatTy), |
| 2491 | input, "incdec.conv"); |
| 2492 | } else { |
| 2493 | value = Builder.CreateFPExt(input, CGF.CGM.FloatTy, "incdec.conv"); |
| 2494 | } |
| 2495 | } |
| 2496 | |
| 2497 | if (value->getType()->isFloatTy()) |
| 2498 | amt = llvm::ConstantFP::get(VMContext, |
| 2499 | llvm::APFloat(static_cast<float>(amount))); |
| 2500 | else if (value->getType()->isDoubleTy()) |
| 2501 | amt = llvm::ConstantFP::get(VMContext, |
| 2502 | llvm::APFloat(static_cast<double>(amount))); |
| 2503 | else { |
| 2504 | // Remaining types are Half, LongDouble or __float128. Convert from float. |
| 2505 | llvm::APFloat F(static_cast<float>(amount)); |
| 2506 | bool ignored; |
| 2507 | const llvm::fltSemantics *FS; |
| 2508 | // Don't use getFloatTypeSemantics because Half isn't |
| 2509 | // necessarily represented using the "half" LLVM type. |
| 2510 | if (value->getType()->isFP128Ty()) |
| 2511 | FS = &CGF.getTarget().getFloat128Format(); |
| 2512 | else if (value->getType()->isHalfTy()) |
| 2513 | FS = &CGF.getTarget().getHalfFormat(); |
| 2514 | else |
| 2515 | FS = &CGF.getTarget().getLongDoubleFormat(); |
| 2516 | F.convert(*FS, llvm::APFloat::rmTowardZero, &ignored); |
| 2517 | amt = llvm::ConstantFP::get(VMContext, F); |
| 2518 | } |
| 2519 | value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec"); |
| 2520 | |
| 2521 | if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) { |
| 2522 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) { |
| 2523 | value = Builder.CreateCall( |
| 2524 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, |
| 2525 | CGF.CGM.FloatTy), |
| 2526 | value, "incdec.conv"); |
| 2527 | } else { |
| 2528 | value = Builder.CreateFPTrunc(value, input->getType(), "incdec.conv"); |
| 2529 | } |
| 2530 | } |
| 2531 | |
| 2532 | // Objective-C pointer types. |
| 2533 | } else { |
| 2534 | const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>(); |
| 2535 | value = CGF.EmitCastToVoidPtr(value); |
| 2536 | |
| 2537 | CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType()); |
| 2538 | if (!isInc) size = -size; |
| 2539 | llvm::Value *sizeValue = |
| 2540 | llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity()); |
| 2541 | |
| 2542 | if (CGF.getLangOpts().isSignedOverflowDefined()) |
| 2543 | value = Builder.CreateGEP(value, sizeValue, "incdec.objptr"); |
| 2544 | else |
| 2545 | value = CGF.EmitCheckedInBoundsGEP(value, sizeValue, |
| 2546 | /*SignedIndices=*/false, isSubtraction, |
| 2547 | E->getExprLoc(), "incdec.objptr"); |
| 2548 | value = Builder.CreateBitCast(value, input->getType()); |
| 2549 | } |
| 2550 | |
| 2551 | if (atomicPHI) { |
| 2552 | llvm::BasicBlock *curBlock = Builder.GetInsertBlock(); |
| 2553 | llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn); |
| 2554 | auto Pair = CGF.EmitAtomicCompareExchange( |
| 2555 | LV, RValue::get(atomicPHI), RValue::get(value), E->getExprLoc()); |
| 2556 | llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), type); |
| 2557 | llvm::Value *success = Pair.second; |
| 2558 | atomicPHI->addIncoming(old, curBlock); |
| 2559 | Builder.CreateCondBr(success, contBB, atomicPHI->getParent()); |
| 2560 | Builder.SetInsertPoint(contBB); |
| 2561 | return isPre ? value : input; |
| 2562 | } |
| 2563 | |
| 2564 | // Store the updated result through the lvalue. |
| 2565 | if (LV.isBitField()) |
| 2566 | CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value); |
| 2567 | else |
| 2568 | CGF.EmitStoreThroughLValue(RValue::get(value), LV); |
| 2569 | |
| 2570 | // If this is a postinc, return the value read from memory, otherwise use the |
| 2571 | // updated value. |
| 2572 | return isPre ? value : input; |
| 2573 | } |
| 2574 | |
| 2575 | |
| 2576 | |
| 2577 | Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) { |
| 2578 | TestAndClearIgnoreResultAssign(); |
| 2579 | // Emit unary minus with EmitSub so we handle overflow cases etc. |
| 2580 | BinOpInfo BinOp; |
| 2581 | BinOp.RHS = Visit(E->getSubExpr()); |
| 2582 | |
| 2583 | if (BinOp.RHS->getType()->isFPOrFPVectorTy()) |
| 2584 | BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType()); |
| 2585 | else |
| 2586 | BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType()); |
| 2587 | BinOp.Ty = E->getType(); |
| 2588 | BinOp.Opcode = BO_Sub; |
| 2589 | // FIXME: once UnaryOperator carries FPFeatures, copy it here. |
| 2590 | BinOp.E = E; |
| 2591 | return EmitSub(BinOp); |
| 2592 | } |
| 2593 | |
| 2594 | Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) { |
| 2595 | TestAndClearIgnoreResultAssign(); |
| 2596 | Value *Op = Visit(E->getSubExpr()); |
| 2597 | return Builder.CreateNot(Op, "neg"); |
| 2598 | } |
| 2599 | |
| 2600 | Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) { |
| 2601 | // Perform vector logical not on comparison with zero vector. |
| 2602 | if (E->getType()->isExtVectorType()) { |
| 2603 | Value *Oper = Visit(E->getSubExpr()); |
| 2604 | Value *Zero = llvm::Constant::getNullValue(Oper->getType()); |
| 2605 | Value *Result; |
| 2606 | if (Oper->getType()->isFPOrFPVectorTy()) |
| 2607 | Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp"); |
| 2608 | else |
| 2609 | Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp"); |
| 2610 | return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext"); |
| 2611 | } |
| 2612 | |
| 2613 | // Compare operand to zero. |
| 2614 | Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr()); |
| 2615 | |
| 2616 | // Invert value. |
| 2617 | // TODO: Could dynamically modify easy computations here. For example, if |
| 2618 | // the operand is an icmp ne, turn into icmp eq. |
| 2619 | BoolVal = Builder.CreateNot(BoolVal, "lnot"); |
| 2620 | |
| 2621 | // ZExt result to the expr type. |
| 2622 | return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext"); |
| 2623 | } |
| 2624 | |
| 2625 | Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) { |
| 2626 | // Try folding the offsetof to a constant. |
| 2627 | Expr::EvalResult EVResult; |
| 2628 | if (E->EvaluateAsInt(EVResult, CGF.getContext())) { |
| 2629 | llvm::APSInt Value = EVResult.Val.getInt(); |
| 2630 | return Builder.getInt(Value); |
| 2631 | } |
| 2632 | |
| 2633 | // Loop over the components of the offsetof to compute the value. |
| 2634 | unsigned n = E->getNumComponents(); |
| 2635 | llvm::Type* ResultType = ConvertType(E->getType()); |
| 2636 | llvm::Value* Result = llvm::Constant::getNullValue(ResultType); |
| 2637 | QualType CurrentType = E->getTypeSourceInfo()->getType(); |
| 2638 | for (unsigned i = 0; i != n; ++i) { |
| 2639 | OffsetOfNode ON = E->getComponent(i); |
| 2640 | llvm::Value *Offset = nullptr; |
| 2641 | switch (ON.getKind()) { |
| 2642 | case OffsetOfNode::Array: { |
| 2643 | // Compute the index |
| 2644 | Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex()); |
| 2645 | llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr); |
| 2646 | bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType(); |
| 2647 | Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv"); |
| 2648 | |
| 2649 | // Save the element type |
| 2650 | CurrentType = |
| 2651 | CGF.getContext().getAsArrayType(CurrentType)->getElementType(); |
| 2652 | |
| 2653 | // Compute the element size |
| 2654 | llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType, |
| 2655 | CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity()); |
| 2656 | |
| 2657 | // Multiply out to compute the result |
| 2658 | Offset = Builder.CreateMul(Idx, ElemSize); |
| 2659 | break; |
| 2660 | } |
| 2661 | |
| 2662 | case OffsetOfNode::Field: { |
| 2663 | FieldDecl *MemberDecl = ON.getField(); |
| 2664 | RecordDecl *RD = CurrentType->castAs<RecordType>()->getDecl(); |
| 2665 | const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD); |
| 2666 | |
| 2667 | // Compute the index of the field in its parent. |
| 2668 | unsigned i = 0; |
| 2669 | // FIXME: It would be nice if we didn't have to loop here! |
| 2670 | for (RecordDecl::field_iterator Field = RD->field_begin(), |
| 2671 | FieldEnd = RD->field_end(); |
| 2672 | Field != FieldEnd; ++Field, ++i) { |
| 2673 | if (*Field == MemberDecl) |
| 2674 | break; |
| 2675 | } |
| 2676 | assert(i < RL.getFieldCount() && "offsetof field in wrong type")((i < RL.getFieldCount() && "offsetof field in wrong type" ) ? static_cast<void> (0) : __assert_fail ("i < RL.getFieldCount() && \"offsetof field in wrong type\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2676, __PRETTY_FUNCTION__)); |
| 2677 | |
| 2678 | // Compute the offset to the field |
| 2679 | int64_t OffsetInt = RL.getFieldOffset(i) / |
| 2680 | CGF.getContext().getCharWidth(); |
| 2681 | Offset = llvm::ConstantInt::get(ResultType, OffsetInt); |
| 2682 | |
| 2683 | // Save the element type. |
| 2684 | CurrentType = MemberDecl->getType(); |
| 2685 | break; |
| 2686 | } |
| 2687 | |
| 2688 | case OffsetOfNode::Identifier: |
| 2689 | llvm_unreachable("dependent __builtin_offsetof")::llvm::llvm_unreachable_internal("dependent __builtin_offsetof" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2689); |
| 2690 | |
| 2691 | case OffsetOfNode::Base: { |
| 2692 | if (ON.getBase()->isVirtual()) { |
| 2693 | CGF.ErrorUnsupported(E, "virtual base in offsetof"); |
| 2694 | continue; |
| 2695 | } |
| 2696 | |
| 2697 | RecordDecl *RD = CurrentType->castAs<RecordType>()->getDecl(); |
| 2698 | const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD); |
| 2699 | |
| 2700 | // Save the element type. |
| 2701 | CurrentType = ON.getBase()->getType(); |
| 2702 | |
| 2703 | // Compute the offset to the base. |
| 2704 | const RecordType *BaseRT = CurrentType->getAs<RecordType>(); |
| 2705 | CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); |
| 2706 | CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD); |
| 2707 | Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity()); |
| 2708 | break; |
| 2709 | } |
| 2710 | } |
| 2711 | Result = Builder.CreateAdd(Result, Offset); |
| 2712 | } |
| 2713 | return Result; |
| 2714 | } |
| 2715 | |
| 2716 | /// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of |
| 2717 | /// argument of the sizeof expression as an integer. |
| 2718 | Value * |
| 2719 | ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr( |
| 2720 | const UnaryExprOrTypeTraitExpr *E) { |
| 2721 | QualType TypeToSize = E->getTypeOfArgument(); |
| 2722 | if (E->getKind() == UETT_SizeOf) { |
| 2723 | if (const VariableArrayType *VAT = |
| 2724 | CGF.getContext().getAsVariableArrayType(TypeToSize)) { |
| 2725 | if (E->isArgumentType()) { |
| 2726 | // sizeof(type) - make sure to emit the VLA size. |
| 2727 | CGF.EmitVariablyModifiedType(TypeToSize); |
| 2728 | } else { |
| 2729 | // C99 6.5.3.4p2: If the argument is an expression of type |
| 2730 | // VLA, it is evaluated. |
| 2731 | CGF.EmitIgnoredExpr(E->getArgumentExpr()); |
| 2732 | } |
| 2733 | |
| 2734 | auto VlaSize = CGF.getVLASize(VAT); |
| 2735 | llvm::Value *size = VlaSize.NumElts; |
| 2736 | |
| 2737 | // Scale the number of non-VLA elements by the non-VLA element size. |
| 2738 | CharUnits eltSize = CGF.getContext().getTypeSizeInChars(VlaSize.Type); |
| 2739 | if (!eltSize.isOne()) |
| 2740 | size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), size); |
| 2741 | |
| 2742 | return size; |
| 2743 | } |
| 2744 | } else if (E->getKind() == UETT_OpenMPRequiredSimdAlign) { |
| 2745 | auto Alignment = |
| 2746 | CGF.getContext() |
| 2747 | .toCharUnitsFromBits(CGF.getContext().getOpenMPDefaultSimdAlign( |
| 2748 | E->getTypeOfArgument()->getPointeeType())) |
| 2749 | .getQuantity(); |
| 2750 | return llvm::ConstantInt::get(CGF.SizeTy, Alignment); |
| 2751 | } |
| 2752 | |
| 2753 | // If this isn't sizeof(vla), the result must be constant; use the constant |
| 2754 | // folding logic so we don't have to duplicate it here. |
| 2755 | return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext())); |
| 2756 | } |
| 2757 | |
| 2758 | Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) { |
| 2759 | Expr *Op = E->getSubExpr(); |
| 2760 | if (Op->getType()->isAnyComplexType()) { |
| 2761 | // If it's an l-value, load through the appropriate subobject l-value. |
| 2762 | // Note that we have to ask E because Op might be an l-value that |
| 2763 | // this won't work for, e.g. an Obj-C property. |
| 2764 | if (E->isGLValue()) |
| 2765 | return CGF.EmitLoadOfLValue(CGF.EmitLValue(E), |
| 2766 | E->getExprLoc()).getScalarVal(); |
| 2767 | |
| 2768 | // Otherwise, calculate and project. |
| 2769 | return CGF.EmitComplexExpr(Op, false, true).first; |
| 2770 | } |
| 2771 | |
| 2772 | return Visit(Op); |
| 2773 | } |
| 2774 | |
| 2775 | Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) { |
| 2776 | Expr *Op = E->getSubExpr(); |
| 2777 | if (Op->getType()->isAnyComplexType()) { |
| 2778 | // If it's an l-value, load through the appropriate subobject l-value. |
| 2779 | // Note that we have to ask E because Op might be an l-value that |
| 2780 | // this won't work for, e.g. an Obj-C property. |
| 2781 | if (Op->isGLValue()) |
| 2782 | return CGF.EmitLoadOfLValue(CGF.EmitLValue(E), |
| 2783 | E->getExprLoc()).getScalarVal(); |
| 2784 | |
| 2785 | // Otherwise, calculate and project. |
| 2786 | return CGF.EmitComplexExpr(Op, true, false).second; |
| 2787 | } |
| 2788 | |
| 2789 | // __imag on a scalar returns zero. Emit the subexpr to ensure side |
| 2790 | // effects are evaluated, but not the actual value. |
| 2791 | if (Op->isGLValue()) |
| 2792 | CGF.EmitLValue(Op); |
| 2793 | else |
| 2794 | CGF.EmitScalarExpr(Op, true); |
| 2795 | return llvm::Constant::getNullValue(ConvertType(E->getType())); |
| 2796 | } |
| 2797 | |
| 2798 | //===----------------------------------------------------------------------===// |
| 2799 | // Binary Operators |
| 2800 | //===----------------------------------------------------------------------===// |
| 2801 | |
| 2802 | BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) { |
| 2803 | TestAndClearIgnoreResultAssign(); |
| 2804 | BinOpInfo Result; |
| 2805 | Result.LHS = Visit(E->getLHS()); |
| 2806 | Result.RHS = Visit(E->getRHS()); |
| 2807 | Result.Ty = E->getType(); |
| 2808 | Result.Opcode = E->getOpcode(); |
| 2809 | Result.FPFeatures = E->getFPFeatures(); |
| 2810 | Result.E = E; |
| 2811 | return Result; |
| 2812 | } |
| 2813 | |
| 2814 | LValue ScalarExprEmitter::EmitCompoundAssignLValue( |
| 2815 | const CompoundAssignOperator *E, |
| 2816 | Value *(ScalarExprEmitter::*Func)(const BinOpInfo &), |
| 2817 | Value *&Result) { |
| 2818 | QualType LHSTy = E->getLHS()->getType(); |
| 2819 | BinOpInfo OpInfo; |
| 2820 | |
| 2821 | if (E->getComputationResultType()->isAnyComplexType()) |
| 2822 | return CGF.EmitScalarCompoundAssignWithComplex(E, Result); |
| 2823 | |
| 2824 | // Emit the RHS first. __block variables need to have the rhs evaluated |
| 2825 | // first, plus this should improve codegen a little. |
| 2826 | OpInfo.RHS = Visit(E->getRHS()); |
| 2827 | OpInfo.Ty = E->getComputationResultType(); |
| 2828 | OpInfo.Opcode = E->getOpcode(); |
| 2829 | OpInfo.FPFeatures = E->getFPFeatures(); |
| 2830 | OpInfo.E = E; |
| 2831 | // Load/convert the LHS. |
| 2832 | LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store); |
| 2833 | |
| 2834 | llvm::PHINode *atomicPHI = nullptr; |
| 2835 | if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) { |
| 2836 | QualType type = atomicTy->getValueType(); |
| 2837 | if (!type->isBooleanType() && type->isIntegerType() && |
| 2838 | !(type->isUnsignedIntegerType() && |
| 2839 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) && |
| 2840 | CGF.getLangOpts().getSignedOverflowBehavior() != |
| 2841 | LangOptions::SOB_Trapping) { |
| 2842 | llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP; |
| 2843 | switch (OpInfo.Opcode) { |
| 2844 | // We don't have atomicrmw operands for *, %, /, <<, >> |
| 2845 | case BO_MulAssign: case BO_DivAssign: |
| 2846 | case BO_RemAssign: |
| 2847 | case BO_ShlAssign: |
| 2848 | case BO_ShrAssign: |
| 2849 | break; |
| 2850 | case BO_AddAssign: |
| 2851 | aop = llvm::AtomicRMWInst::Add; |
| 2852 | break; |
| 2853 | case BO_SubAssign: |
| 2854 | aop = llvm::AtomicRMWInst::Sub; |
| 2855 | break; |
| 2856 | case BO_AndAssign: |
| 2857 | aop = llvm::AtomicRMWInst::And; |
| 2858 | break; |
| 2859 | case BO_XorAssign: |
| 2860 | aop = llvm::AtomicRMWInst::Xor; |
| 2861 | break; |
| 2862 | case BO_OrAssign: |
| 2863 | aop = llvm::AtomicRMWInst::Or; |
| 2864 | break; |
| 2865 | default: |
| 2866 | llvm_unreachable("Invalid compound assignment type")::llvm::llvm_unreachable_internal("Invalid compound assignment type" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2866); |
| 2867 | } |
| 2868 | if (aop != llvm::AtomicRMWInst::BAD_BINOP) { |
| 2869 | llvm::Value *amt = CGF.EmitToMemory( |
| 2870 | EmitScalarConversion(OpInfo.RHS, E->getRHS()->getType(), LHSTy, |
| 2871 | E->getExprLoc()), |
| 2872 | LHSTy); |
| 2873 | Builder.CreateAtomicRMW(aop, LHSLV.getPointer(), amt, |
| 2874 | llvm::AtomicOrdering::SequentiallyConsistent); |
| 2875 | return LHSLV; |
| 2876 | } |
| 2877 | } |
| 2878 | // FIXME: For floating point types, we should be saving and restoring the |
| 2879 | // floating point environment in the loop. |
| 2880 | llvm::BasicBlock *startBB = Builder.GetInsertBlock(); |
| 2881 | llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn); |
| 2882 | OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc()); |
| 2883 | OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type); |
| 2884 | Builder.CreateBr(opBB); |
| 2885 | Builder.SetInsertPoint(opBB); |
| 2886 | atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2); |
| 2887 | atomicPHI->addIncoming(OpInfo.LHS, startBB); |
| 2888 | OpInfo.LHS = atomicPHI; |
| 2889 | } |
| 2890 | else |
| 2891 | OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc()); |
| 2892 | |
| 2893 | SourceLocation Loc = E->getExprLoc(); |
| 2894 | OpInfo.LHS = |
| 2895 | EmitScalarConversion(OpInfo.LHS, LHSTy, E->getComputationLHSType(), Loc); |
| 2896 | |
| 2897 | // Expand the binary operator. |
| 2898 | Result = (this->*Func)(OpInfo); |
| 2899 | |
| 2900 | // Convert the result back to the LHS type, |
| 2901 | // potentially with Implicit Conversion sanitizer check. |
| 2902 | Result = EmitScalarConversion(Result, E->getComputationResultType(), LHSTy, |
| 2903 | Loc, ScalarConversionOpts(CGF.SanOpts)); |
| 2904 | |
| 2905 | if (atomicPHI) { |
| 2906 | llvm::BasicBlock *curBlock = Builder.GetInsertBlock(); |
| 2907 | llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn); |
| 2908 | auto Pair = CGF.EmitAtomicCompareExchange( |
| 2909 | LHSLV, RValue::get(atomicPHI), RValue::get(Result), E->getExprLoc()); |
| 2910 | llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), LHSTy); |
| 2911 | llvm::Value *success = Pair.second; |
| 2912 | atomicPHI->addIncoming(old, curBlock); |
| 2913 | Builder.CreateCondBr(success, contBB, atomicPHI->getParent()); |
| 2914 | Builder.SetInsertPoint(contBB); |
| 2915 | return LHSLV; |
| 2916 | } |
| 2917 | |
| 2918 | // Store the result value into the LHS lvalue. Bit-fields are handled |
| 2919 | // specially because the result is altered by the store, i.e., [C99 6.5.16p1] |
| 2920 | // 'An assignment expression has the value of the left operand after the |
| 2921 | // assignment...'. |
| 2922 | if (LHSLV.isBitField()) |
| 2923 | CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result); |
| 2924 | else |
| 2925 | CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV); |
| 2926 | |
| 2927 | return LHSLV; |
| 2928 | } |
| 2929 | |
| 2930 | Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E, |
| 2931 | Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) { |
| 2932 | bool Ignore = TestAndClearIgnoreResultAssign(); |
| 2933 | Value *RHS = nullptr; |
| 2934 | LValue LHS = EmitCompoundAssignLValue(E, Func, RHS); |
| 2935 | |
| 2936 | // If the result is clearly ignored, return now. |
| 2937 | if (Ignore) |
| 2938 | return nullptr; |
| 2939 | |
| 2940 | // The result of an assignment in C is the assigned r-value. |
| 2941 | if (!CGF.getLangOpts().CPlusPlus) |
| 2942 | return RHS; |
| 2943 | |
| 2944 | // If the lvalue is non-volatile, return the computed value of the assignment. |
| 2945 | if (!LHS.isVolatileQualified()) |
| 2946 | return RHS; |
| 2947 | |
| 2948 | // Otherwise, reload the value. |
| 2949 | return EmitLoadOfLValue(LHS, E->getExprLoc()); |
| 2950 | } |
| 2951 | |
| 2952 | void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck( |
| 2953 | const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) { |
| 2954 | SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks; |
| 2955 | |
| 2956 | if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) { |
| 2957 | Checks.push_back(std::make_pair(Builder.CreateICmpNE(Ops.RHS, Zero), |
| 2958 | SanitizerKind::IntegerDivideByZero)); |
| 2959 | } |
| 2960 | |
| 2961 | const auto *BO = cast<BinaryOperator>(Ops.E); |
| 2962 | if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow) && |
| 2963 | Ops.Ty->hasSignedIntegerRepresentation() && |
| 2964 | !IsWidenedIntegerOp(CGF.getContext(), BO->getLHS()) && |
| 2965 | Ops.mayHaveIntegerOverflow()) { |
| 2966 | llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType()); |
| 2967 | |
| 2968 | llvm::Value *IntMin = |
| 2969 | Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth())); |
| 2970 | llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL); |
| 2971 | |
| 2972 | llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin); |
| 2973 | llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne); |
| 2974 | llvm::Value *NotOverflow = Builder.CreateOr(LHSCmp, RHSCmp, "or"); |
| 2975 | Checks.push_back( |
| 2976 | std::make_pair(NotOverflow, SanitizerKind::SignedIntegerOverflow)); |
| 2977 | } |
| 2978 | |
| 2979 | if (Checks.size() > 0) |
| 2980 | EmitBinOpCheck(Checks, Ops); |
| 2981 | } |
| 2982 | |
| 2983 | Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) { |
| 2984 | { |
| 2985 | CodeGenFunction::SanitizerScope SanScope(&CGF); |
| 2986 | if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) || |
| 2987 | CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) && |
| 2988 | Ops.Ty->isIntegerType() && |
| 2989 | (Ops.mayHaveIntegerDivisionByZero() || Ops.mayHaveIntegerOverflow())) { |
| 2990 | llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty)); |
| 2991 | EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true); |
| 2992 | } else if (CGF.SanOpts.has(SanitizerKind::FloatDivideByZero) && |
| 2993 | Ops.Ty->isRealFloatingType() && |
| 2994 | Ops.mayHaveFloatDivisionByZero()) { |
| 2995 | llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty)); |
| 2996 | llvm::Value *NonZero = Builder.CreateFCmpUNE(Ops.RHS, Zero); |
| 2997 | EmitBinOpCheck(std::make_pair(NonZero, SanitizerKind::FloatDivideByZero), |
| 2998 | Ops); |
| 2999 | } |
| 3000 | } |
| 3001 | |
| 3002 | if (Ops.LHS->getType()->isFPOrFPVectorTy()) { |
| 3003 | llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div"); |
| 3004 | if (CGF.getLangOpts().OpenCL && |
| 3005 | !CGF.CGM.getCodeGenOpts().CorrectlyRoundedDivSqrt) { |
| 3006 | // OpenCL v1.1 s7.4: minimum accuracy of single precision / is 2.5ulp |
| 3007 | // OpenCL v1.2 s5.6.4.2: The -cl-fp32-correctly-rounded-divide-sqrt |
| 3008 | // build option allows an application to specify that single precision |
| 3009 | // floating-point divide (x/y and 1/x) and sqrt used in the program |
| 3010 | // source are correctly rounded. |
| 3011 | llvm::Type *ValTy = Val->getType(); |
| 3012 | if (ValTy->isFloatTy() || |
| 3013 | (isa<llvm::VectorType>(ValTy) && |
| 3014 | cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy())) |
| 3015 | CGF.SetFPAccuracy(Val, 2.5); |
| 3016 | } |
| 3017 | return Val; |
| 3018 | } |
| 3019 | else if (Ops.Ty->hasUnsignedIntegerRepresentation()) |
| 3020 | return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div"); |
| 3021 | else |
| 3022 | return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div"); |
| 3023 | } |
| 3024 | |
| 3025 | Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) { |
| 3026 | // Rem in C can't be a floating point type: C99 6.5.5p2. |
| 3027 | if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) || |
| 3028 | CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) && |
| 3029 | Ops.Ty->isIntegerType() && |
| 3030 | (Ops.mayHaveIntegerDivisionByZero() || Ops.mayHaveIntegerOverflow())) { |
| 3031 | CodeGenFunction::SanitizerScope SanScope(&CGF); |
| 3032 | llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty)); |
| 3033 | EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false); |
| 3034 | } |
| 3035 | |
| 3036 | if (Ops.Ty->hasUnsignedIntegerRepresentation()) |
| 3037 | return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem"); |
| 3038 | else |
| 3039 | return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem"); |
| 3040 | } |
| 3041 | |
| 3042 | Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) { |
| 3043 | unsigned IID; |
| 3044 | unsigned OpID = 0; |
| 3045 | |
| 3046 | bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType(); |
| 3047 | switch (Ops.Opcode) { |
| 3048 | case BO_Add: |
| 3049 | case BO_AddAssign: |
| 3050 | OpID = 1; |
| 3051 | IID = isSigned ? llvm::Intrinsic::sadd_with_overflow : |
| 3052 | llvm::Intrinsic::uadd_with_overflow; |
| 3053 | break; |
| 3054 | case BO_Sub: |
| 3055 | case BO_SubAssign: |
| 3056 | OpID = 2; |
| 3057 | IID = isSigned ? llvm::Intrinsic::ssub_with_overflow : |
| 3058 | llvm::Intrinsic::usub_with_overflow; |
| 3059 | break; |
| 3060 | case BO_Mul: |
| 3061 | case BO_MulAssign: |
| 3062 | OpID = 3; |
| 3063 | IID = isSigned ? llvm::Intrinsic::smul_with_overflow : |
| 3064 | llvm::Intrinsic::umul_with_overflow; |
| 3065 | break; |
| 3066 | default: |
| 3067 | llvm_unreachable("Unsupported operation for overflow detection")::llvm::llvm_unreachable_internal("Unsupported operation for overflow detection" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3067); |
| 3068 | } |
| 3069 | OpID <<= 1; |
| 3070 | if (isSigned) |
| 3071 | OpID |= 1; |
| 3072 | |
| 3073 | CodeGenFunction::SanitizerScope SanScope(&CGF); |
| 3074 | llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty); |
| 3075 | |
| 3076 | llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy); |
| 3077 | |
| 3078 | Value *resultAndOverflow = Builder.CreateCall(intrinsic, {Ops.LHS, Ops.RHS}); |
| 3079 | Value *result = Builder.CreateExtractValue(resultAndOverflow, 0); |
| 3080 | Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1); |
| 3081 | |
| 3082 | // Handle overflow with llvm.trap if no custom handler has been specified. |
| 3083 | const std::string *handlerName = |
| 3084 | &CGF.getLangOpts().OverflowHandler; |
| 3085 | if (handlerName->empty()) { |
| 3086 | // If the signed-integer-overflow sanitizer is enabled, emit a call to its |
| 3087 | // runtime. Otherwise, this is a -ftrapv check, so just emit a trap. |
| 3088 | if (!isSigned || CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) { |
| 3089 | llvm::Value *NotOverflow = Builder.CreateNot(overflow); |
| 3090 | SanitizerMask Kind = isSigned ? SanitizerKind::SignedIntegerOverflow |
| 3091 | : SanitizerKind::UnsignedIntegerOverflow; |
| 3092 | EmitBinOpCheck(std::make_pair(NotOverflow, Kind), Ops); |
| 3093 | } else |
| 3094 | CGF.EmitTrapCheck(Builder.CreateNot(overflow)); |
| 3095 | return result; |
| 3096 | } |
| 3097 | |
| 3098 | // Branch in case of overflow. |
| 3099 | llvm::BasicBlock *initialBB = Builder.GetInsertBlock(); |
| 3100 | llvm::BasicBlock *continueBB = |
| 3101 | CGF.createBasicBlock("nooverflow", CGF.CurFn, initialBB->getNextNode()); |
| 3102 | llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn); |
| 3103 | |
| 3104 | Builder.CreateCondBr(overflow, overflowBB, continueBB); |
| 3105 | |
| 3106 | // If an overflow handler is set, then we want to call it and then use its |
| 3107 | // result, if it returns. |
| 3108 | Builder.SetInsertPoint(overflowBB); |
| 3109 | |
| 3110 | // Get the overflow handler. |
| 3111 | llvm::Type *Int8Ty = CGF.Int8Ty; |
| 3112 | llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty }; |
| 3113 | llvm::FunctionType *handlerTy = |
| 3114 | llvm::FunctionType::get(CGF.Int64Ty, argTypes, true); |
| 3115 | llvm::FunctionCallee handler = |
| 3116 | CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName); |
| 3117 | |
| 3118 | // Sign extend the args to 64-bit, so that we can use the same handler for |
| 3119 | // all types of overflow. |
| 3120 | llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty); |
| 3121 | llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty); |
| 3122 | |
| 3123 | // Call the handler with the two arguments, the operation, and the size of |
| 3124 | // the result. |
| 3125 | llvm::Value *handlerArgs[] = { |
| 3126 | lhs, |
| 3127 | rhs, |
| 3128 | Builder.getInt8(OpID), |
| 3129 | Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth()) |
| 3130 | }; |
| 3131 | llvm::Value *handlerResult = |
| 3132 | CGF.EmitNounwindRuntimeCall(handler, handlerArgs); |
| 3133 | |
| 3134 | // Truncate the result back to the desired size. |
| 3135 | handlerResult = Builder.CreateTrunc(handlerResult, opTy); |
| 3136 | Builder.CreateBr(continueBB); |
| 3137 | |
| 3138 | Builder.SetInsertPoint(continueBB); |
| 3139 | llvm::PHINode *phi = Builder.CreatePHI(opTy, 2); |
| 3140 | phi->addIncoming(result, initialBB); |
| 3141 | phi->addIncoming(handlerResult, overflowBB); |
| 3142 | |
| 3143 | return phi; |
| 3144 | } |
| 3145 | |
| 3146 | /// Emit pointer + index arithmetic. |
| 3147 | static Value *emitPointerArithmetic(CodeGenFunction &CGF, |
| 3148 | const BinOpInfo &op, |
| 3149 | bool isSubtraction) { |
| 3150 | // Must have binary (not unary) expr here. Unary pointer |
| 3151 | // increment/decrement doesn't use this path. |
| 3152 | const BinaryOperator *expr = cast<BinaryOperator>(op.E); |
| 3153 | |
| 3154 | Value *pointer = op.LHS; |
| 3155 | Expr *pointerOperand = expr->getLHS(); |
| 3156 | Value *index = op.RHS; |
| 3157 | Expr *indexOperand = expr->getRHS(); |
| 3158 | |
| 3159 | // In a subtraction, the LHS is always the pointer. |
| 3160 | if (!isSubtraction && !pointer->getType()->isPointerTy()) { |
| 3161 | std::swap(pointer, index); |
| 3162 | std::swap(pointerOperand, indexOperand); |
| 3163 | } |
| 3164 | |
| 3165 | bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType(); |
| 3166 | |
| 3167 | unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth(); |
| 3168 | auto &DL = CGF.CGM.getDataLayout(); |
| 3169 | auto PtrTy = cast<llvm::PointerType>(pointer->getType()); |
| 3170 | |
| 3171 | // Some versions of glibc and gcc use idioms (particularly in their malloc |
| 3172 | // routines) that add a pointer-sized integer (known to be a pointer value) |
| 3173 | // to a null pointer in order to cast the value back to an integer or as |
| 3174 | // part of a pointer alignment algorithm. This is undefined behavior, but |
| 3175 | // we'd like to be able to compile programs that use it. |
| 3176 | // |
| 3177 | // Normally, we'd generate a GEP with a null-pointer base here in response |
| 3178 | // to that code, but it's also UB to dereference a pointer created that |
| 3179 | // way. Instead (as an acknowledged hack to tolerate the idiom) we will |
| 3180 | // generate a direct cast of the integer value to a pointer. |
| 3181 | // |
| 3182 | // The idiom (p = nullptr + N) is not met if any of the following are true: |
| 3183 | // |
| 3184 | // The operation is subtraction. |
| 3185 | // The index is not pointer-sized. |
| 3186 | // The pointer type is not byte-sized. |
| 3187 | // |
| 3188 | if (BinaryOperator::isNullPointerArithmeticExtension(CGF.getContext(), |
| 3189 | op.Opcode, |
| 3190 | expr->getLHS(), |
| 3191 | expr->getRHS())) |
| 3192 | return CGF.Builder.CreateIntToPtr(index, pointer->getType()); |
| 3193 | |
| 3194 | if (width != DL.getTypeSizeInBits(PtrTy)) { |
| 3195 | // Zero-extend or sign-extend the pointer value according to |
| 3196 | // whether the index is signed or not. |
| 3197 | index = CGF.Builder.CreateIntCast(index, DL.getIntPtrType(PtrTy), isSigned, |
| 3198 | "idx.ext"); |
| 3199 | } |
| 3200 | |
| 3201 | // If this is subtraction, negate the index. |
| 3202 | if (isSubtraction) |
| 3203 | index = CGF.Builder.CreateNeg(index, "idx.neg"); |
| 3204 | |
| 3205 | if (CGF.SanOpts.has(SanitizerKind::ArrayBounds)) |
| 3206 | CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(), |
| 3207 | /*Accessed*/ false); |
| 3208 | |
| 3209 | const PointerType *pointerType |
| 3210 | = pointerOperand->getType()->getAs<PointerType>(); |
| 3211 | if (!pointerType) { |
| 3212 | QualType objectType = pointerOperand->getType() |
| 3213 | ->castAs<ObjCObjectPointerType>() |
| 3214 | ->getPointeeType(); |
| 3215 | llvm::Value *objectSize |
| 3216 | = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType)); |
| 3217 | |
| 3218 | index = CGF.Builder.CreateMul(index, objectSize); |
| 3219 | |
| 3220 | Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy); |
| 3221 | result = CGF.Builder.CreateGEP(result, index, "add.ptr"); |
| 3222 | return CGF.Builder.CreateBitCast(result, pointer->getType()); |
| 3223 | } |
| 3224 | |
| 3225 | QualType elementType = pointerType->getPointeeType(); |
| 3226 | if (const VariableArrayType *vla |
| 3227 | = CGF.getContext().getAsVariableArrayType(elementType)) { |
| 3228 | // The element count here is the total number of non-VLA elements. |
| 3229 | llvm::Value *numElements = CGF.getVLASize(vla).NumElts; |
| 3230 | |
| 3231 | // Effectively, the multiply by the VLA size is part of the GEP. |
| 3232 | // GEP indexes are signed, and scaling an index isn't permitted to |
| 3233 | // signed-overflow, so we use the same semantics for our explicit |
| 3234 | // multiply. We suppress this if overflow is not undefined behavior. |
| 3235 | if (CGF.getLangOpts().isSignedOverflowDefined()) { |
| 3236 | index = CGF.Builder.CreateMul(index, numElements, "vla.index"); |
| 3237 | pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr"); |
| 3238 | } else { |
| 3239 | index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index"); |
| 3240 | pointer = |
| 3241 | CGF.EmitCheckedInBoundsGEP(pointer, index, isSigned, isSubtraction, |
| 3242 | op.E->getExprLoc(), "add.ptr"); |
| 3243 | } |
| 3244 | return pointer; |
| 3245 | } |
| 3246 | |
| 3247 | // Explicitly handle GNU void* and function pointer arithmetic extensions. The |
| 3248 | // GNU void* casts amount to no-ops since our void* type is i8*, but this is |
| 3249 | // future proof. |
| 3250 | if (elementType->isVoidType() || elementType->isFunctionType()) { |
| 3251 | Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy); |
| 3252 | result = CGF.Builder.CreateGEP(result, index, "add.ptr"); |
| 3253 | return CGF.Builder.CreateBitCast(result, pointer->getType()); |
| 3254 | } |
| 3255 | |
| 3256 | if (CGF.getLangOpts().isSignedOverflowDefined()) |
| 3257 | return CGF.Builder.CreateGEP(pointer, index, "add.ptr"); |
| 3258 | |
| 3259 | return CGF.EmitCheckedInBoundsGEP(pointer, index, isSigned, isSubtraction, |
| 3260 | op.E->getExprLoc(), "add.ptr"); |
| 3261 | } |
| 3262 | |
| 3263 | // Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and |
| 3264 | // Addend. Use negMul and negAdd to negate the first operand of the Mul or |
| 3265 | // the add operand respectively. This allows fmuladd to represent a*b-c, or |
| 3266 | // c-a*b. Patterns in LLVM should catch the negated forms and translate them to |
| 3267 | // efficient operations. |
| 3268 | static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend, |
| 3269 | const CodeGenFunction &CGF, CGBuilderTy &Builder, |
| 3270 | bool negMul, bool negAdd) { |
| 3271 | assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.")((!(negMul && negAdd) && "Only one of negMul and negAdd should be set." ) ? static_cast<void> (0) : __assert_fail ("!(negMul && negAdd) && \"Only one of negMul and negAdd should be set.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3271, __PRETTY_FUNCTION__)); |
| 3272 | |
| 3273 | Value *MulOp0 = MulOp->getOperand(0); |
| 3274 | Value *MulOp1 = MulOp->getOperand(1); |
| 3275 | if (negMul) { |
| 3276 | MulOp0 = |
| 3277 | Builder.CreateFSub( |
| 3278 | llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0, |
| 3279 | "neg"); |
| 3280 | } else if (negAdd) { |
| 3281 | Addend = |
| 3282 | Builder.CreateFSub( |
| 3283 | llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend, |
| 3284 | "neg"); |
| 3285 | } |
| 3286 | |
| 3287 | Value *FMulAdd = Builder.CreateCall( |
| 3288 | CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()), |
| 3289 | {MulOp0, MulOp1, Addend}); |
| 3290 | MulOp->eraseFromParent(); |
| 3291 | |
| 3292 | return FMulAdd; |
| 3293 | } |
| 3294 | |
| 3295 | // Check whether it would be legal to emit an fmuladd intrinsic call to |
| 3296 | // represent op and if so, build the fmuladd. |
| 3297 | // |
| 3298 | // Checks that (a) the operation is fusable, and (b) -ffp-contract=on. |
| 3299 | // Does NOT check the type of the operation - it's assumed that this function |
| 3300 | // will be called from contexts where it's known that the type is contractable. |
| 3301 | static Value* tryEmitFMulAdd(const BinOpInfo &op, |
| 3302 | const CodeGenFunction &CGF, CGBuilderTy &Builder, |
| 3303 | bool isSub=false) { |
| 3304 | |
| 3305 | assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||(((op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && "Only fadd/fsub can be the root of an fmuladd." ) ? static_cast<void> (0) : __assert_fail ("(op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && \"Only fadd/fsub can be the root of an fmuladd.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3307, __PRETTY_FUNCTION__)) |
| 3306 | op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&(((op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && "Only fadd/fsub can be the root of an fmuladd." ) ? static_cast<void> (0) : __assert_fail ("(op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && \"Only fadd/fsub can be the root of an fmuladd.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3307, __PRETTY_FUNCTION__)) |
| 3307 | "Only fadd/fsub can be the root of an fmuladd.")(((op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && "Only fadd/fsub can be the root of an fmuladd." ) ? static_cast<void> (0) : __assert_fail ("(op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && \"Only fadd/fsub can be the root of an fmuladd.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3307, __PRETTY_FUNCTION__)); |
| 3308 | |
| 3309 | // Check whether this op is marked as fusable. |
| 3310 | if (!op.FPFeatures.allowFPContractWithinStatement()) |
| 3311 | return nullptr; |
| 3312 | |
| 3313 | // We have a potentially fusable op. Look for a mul on one of the operands. |
| 3314 | // Also, make sure that the mul result isn't used directly. In that case, |
| 3315 | // there's no point creating a muladd operation. |
| 3316 | if (auto *LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) { |
| 3317 | if (LHSBinOp->getOpcode() == llvm::Instruction::FMul && |
| 3318 | LHSBinOp->use_empty()) |
| 3319 | return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub); |
| 3320 | } |
| 3321 | if (auto *RHSBinOp = dyn_cast<llvm::BinaryOperator>(op.RHS)) { |
| 3322 | if (RHSBinOp->getOpcode() == llvm::Instruction::FMul && |
| 3323 | RHSBinOp->use_empty()) |
| 3324 | return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false); |
| 3325 | } |
| 3326 | |
| 3327 | return nullptr; |
| 3328 | } |
| 3329 | |
| 3330 | Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) { |
| 3331 | if (op.LHS->getType()->isPointerTy() || |
| 3332 | op.RHS->getType()->isPointerTy()) |
| 3333 | return emitPointerArithmetic(CGF, op, CodeGenFunction::NotSubtraction); |
| 3334 | |
| 3335 | if (op.Ty->isSignedIntegerOrEnumerationType()) { |
| 3336 | switch (CGF.getLangOpts().getSignedOverflowBehavior()) { |
| 3337 | case LangOptions::SOB_Defined: |
| 3338 | return Builder.CreateAdd(op.LHS, op.RHS, "add"); |
| 3339 | case LangOptions::SOB_Undefined: |
| 3340 | if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) |
| 3341 | return Builder.CreateNSWAdd(op.LHS, op.RHS, "add"); |
| 3342 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
| 3343 | case LangOptions::SOB_Trapping: |
| 3344 | if (CanElideOverflowCheck(CGF.getContext(), op)) |
| 3345 | return Builder.CreateNSWAdd(op.LHS, op.RHS, "add"); |
| 3346 | return EmitOverflowCheckedBinOp(op); |
| 3347 | } |
| 3348 | } |
| 3349 | |
| 3350 | if (op.Ty->isUnsignedIntegerType() && |
| 3351 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) && |
| 3352 | !CanElideOverflowCheck(CGF.getContext(), op)) |
| 3353 | return EmitOverflowCheckedBinOp(op); |
| 3354 | |
| 3355 | if (op.LHS->getType()->isFPOrFPVectorTy()) { |
| 3356 | // Try to form an fmuladd. |
| 3357 | if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder)) |
| 3358 | return FMulAdd; |
| 3359 | |
| 3360 | Value *V = Builder.CreateFAdd(op.LHS, op.RHS, "add"); |
| 3361 | return propagateFMFlags(V, op); |
| 3362 | } |
| 3363 | |
| 3364 | if (op.isFixedPointBinOp()) |
| 3365 | return EmitFixedPointBinOp(op); |
| 3366 | |
| 3367 | return Builder.CreateAdd(op.LHS, op.RHS, "add"); |
| 3368 | } |
| 3369 | |
| 3370 | /// The resulting value must be calculated with exact precision, so the operands |
| 3371 | /// may not be the same type. |
| 3372 | Value *ScalarExprEmitter::EmitFixedPointBinOp(const BinOpInfo &op) { |
| 3373 | using llvm::APSInt; |
| 3374 | using llvm::ConstantInt; |
| 3375 | |
| 3376 | const auto *BinOp = cast<BinaryOperator>(op.E); |
| 3377 | |
| 3378 | // The result is a fixed point type and at least one of the operands is fixed |
| 3379 | // point while the other is either fixed point or an int. This resulting type |
| 3380 | // should be determined by Sema::handleFixedPointConversions(). |
| 3381 | QualType ResultTy = op.Ty; |
| 3382 | QualType LHSTy = BinOp->getLHS()->getType(); |
| 3383 | QualType RHSTy = BinOp->getRHS()->getType(); |
| 3384 | ASTContext &Ctx = CGF.getContext(); |
| 3385 | Value *LHS = op.LHS; |
| 3386 | Value *RHS = op.RHS; |
| 3387 | |
| 3388 | auto LHSFixedSema = Ctx.getFixedPointSemantics(LHSTy); |
| 3389 | auto RHSFixedSema = Ctx.getFixedPointSemantics(RHSTy); |
| 3390 | auto ResultFixedSema = Ctx.getFixedPointSemantics(ResultTy); |
| 3391 | auto CommonFixedSema = LHSFixedSema.getCommonSemantics(RHSFixedSema); |
| 3392 | |
| 3393 | // Convert the operands to the full precision type. |
| 3394 | Value *FullLHS = EmitFixedPointConversion(LHS, LHSFixedSema, CommonFixedSema, |
| 3395 | BinOp->getExprLoc()); |
| 3396 | Value *FullRHS = EmitFixedPointConversion(RHS, RHSFixedSema, CommonFixedSema, |
| 3397 | BinOp->getExprLoc()); |
| 3398 | |
| 3399 | // Perform the actual addition. |
| 3400 | Value *Result; |
| 3401 | switch (BinOp->getOpcode()) { |
| 3402 | case BO_Add: { |
| 3403 | if (ResultFixedSema.isSaturated()) { |
| 3404 | llvm::Intrinsic::ID IID = ResultFixedSema.isSigned() |
| 3405 | ? llvm::Intrinsic::sadd_sat |
| 3406 | : llvm::Intrinsic::uadd_sat; |
| 3407 | Result = Builder.CreateBinaryIntrinsic(IID, FullLHS, FullRHS); |
| 3408 | } else { |
| 3409 | Result = Builder.CreateAdd(FullLHS, FullRHS); |
| 3410 | } |
| 3411 | break; |
| 3412 | } |
| 3413 | case BO_Sub: { |
| 3414 | if (ResultFixedSema.isSaturated()) { |
| 3415 | llvm::Intrinsic::ID IID = ResultFixedSema.isSigned() |
| 3416 | ? llvm::Intrinsic::ssub_sat |
| 3417 | : llvm::Intrinsic::usub_sat; |
| 3418 | Result = Builder.CreateBinaryIntrinsic(IID, FullLHS, FullRHS); |
| 3419 | } else { |
| 3420 | Result = Builder.CreateSub(FullLHS, FullRHS); |
| 3421 | } |
| 3422 | break; |
| 3423 | } |
| 3424 | case BO_LT: |
| 3425 | return CommonFixedSema.isSigned() ? Builder.CreateICmpSLT(FullLHS, FullRHS) |
| 3426 | : Builder.CreateICmpULT(FullLHS, FullRHS); |
| 3427 | case BO_GT: |
| 3428 | return CommonFixedSema.isSigned() ? Builder.CreateICmpSGT(FullLHS, FullRHS) |
| 3429 | : Builder.CreateICmpUGT(FullLHS, FullRHS); |
| 3430 | case BO_LE: |
| 3431 | return CommonFixedSema.isSigned() ? Builder.CreateICmpSLE(FullLHS, FullRHS) |
| 3432 | : Builder.CreateICmpULE(FullLHS, FullRHS); |
| 3433 | case BO_GE: |
| 3434 | return CommonFixedSema.isSigned() ? Builder.CreateICmpSGE(FullLHS, FullRHS) |
| 3435 | : Builder.CreateICmpUGE(FullLHS, FullRHS); |
| 3436 | case BO_EQ: |
| 3437 | // For equality operations, we assume any padding bits on unsigned types are |
| 3438 | // zero'd out. They could be overwritten through non-saturating operations |
| 3439 | // that cause overflow, but this leads to undefined behavior. |
| 3440 | return Builder.CreateICmpEQ(FullLHS, FullRHS); |
| 3441 | case BO_NE: |
| 3442 | return Builder.CreateICmpNE(FullLHS, FullRHS); |
| 3443 | case BO_Mul: |
| 3444 | case BO_Div: |
| 3445 | case BO_Shl: |
| 3446 | case BO_Shr: |
| 3447 | case BO_Cmp: |
| 3448 | case BO_LAnd: |
| 3449 | case BO_LOr: |
| 3450 | case BO_MulAssign: |
| 3451 | case BO_DivAssign: |
| 3452 | case BO_AddAssign: |
| 3453 | case BO_SubAssign: |
| 3454 | case BO_ShlAssign: |
| 3455 | case BO_ShrAssign: |
| 3456 | llvm_unreachable("Found unimplemented fixed point binary operation")::llvm::llvm_unreachable_internal("Found unimplemented fixed point binary operation" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3456); |
| 3457 | case BO_PtrMemD: |
| 3458 | case BO_PtrMemI: |
| 3459 | case BO_Rem: |
| 3460 | case BO_Xor: |
| 3461 | case BO_And: |
| 3462 | case BO_Or: |
| 3463 | case BO_Assign: |
| 3464 | case BO_RemAssign: |
| 3465 | case BO_AndAssign: |
| 3466 | case BO_XorAssign: |
| 3467 | case BO_OrAssign: |
| 3468 | case BO_Comma: |
| 3469 | llvm_unreachable("Found unsupported binary operation for fixed point types.")::llvm::llvm_unreachable_internal("Found unsupported binary operation for fixed point types." , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3469); |
| 3470 | } |
| 3471 | |
| 3472 | // Convert to the result type. |
| 3473 | return EmitFixedPointConversion(Result, CommonFixedSema, ResultFixedSema, |
| 3474 | BinOp->getExprLoc()); |
| 3475 | } |
| 3476 | |
| 3477 | Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) { |
| 3478 | // The LHS is always a pointer if either side is. |
| 3479 | if (!op.LHS->getType()->isPointerTy()) { |
| 3480 | if (op.Ty->isSignedIntegerOrEnumerationType()) { |
| 3481 | switch (CGF.getLangOpts().getSignedOverflowBehavior()) { |
| 3482 | case LangOptions::SOB_Defined: |
| 3483 | return Builder.CreateSub(op.LHS, op.RHS, "sub"); |
| 3484 | case LangOptions::SOB_Undefined: |
| 3485 | if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) |
| 3486 | return Builder.CreateNSWSub(op.LHS, op.RHS, "sub"); |
| 3487 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
| 3488 | case LangOptions::SOB_Trapping: |
| 3489 | if (CanElideOverflowCheck(CGF.getContext(), op)) |
| 3490 | return Builder.CreateNSWSub(op.LHS, op.RHS, "sub"); |
| 3491 | return EmitOverflowCheckedBinOp(op); |
| 3492 | } |
| 3493 | } |
| 3494 | |
| 3495 | if (op.Ty->isUnsignedIntegerType() && |
| 3496 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) && |
| 3497 | !CanElideOverflowCheck(CGF.getContext(), op)) |
| 3498 | return EmitOverflowCheckedBinOp(op); |
| 3499 | |
| 3500 | if (op.LHS->getType()->isFPOrFPVectorTy()) { |
| 3501 | // Try to form an fmuladd. |
| 3502 | if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true)) |
| 3503 | return FMulAdd; |
| 3504 | Value *V = Builder.CreateFSub(op.LHS, op.RHS, "sub"); |
| 3505 | return propagateFMFlags(V, op); |
| 3506 | } |
| 3507 | |
| 3508 | if (op.isFixedPointBinOp()) |
| 3509 | return EmitFixedPointBinOp(op); |
| 3510 | |
| 3511 | return Builder.CreateSub(op.LHS, op.RHS, "sub"); |
| 3512 | } |
| 3513 | |
| 3514 | // If the RHS is not a pointer, then we have normal pointer |
| 3515 | // arithmetic. |
| 3516 | if (!op.RHS->getType()->isPointerTy()) |
| 3517 | return emitPointerArithmetic(CGF, op, CodeGenFunction::IsSubtraction); |
| 3518 | |
| 3519 | // Otherwise, this is a pointer subtraction. |
| 3520 | |
| 3521 | // Do the raw subtraction part. |
| 3522 | llvm::Value *LHS |
| 3523 | = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast"); |
| 3524 | llvm::Value *RHS |
| 3525 | = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast"); |
| 3526 | Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub"); |
| 3527 | |
| 3528 | // Okay, figure out the element size. |
| 3529 | const BinaryOperator *expr = cast<BinaryOperator>(op.E); |
| 3530 | QualType elementType = expr->getLHS()->getType()->getPointeeType(); |
| 3531 | |
| 3532 | llvm::Value *divisor = nullptr; |
| 3533 | |
| 3534 | // For a variable-length array, this is going to be non-constant. |
| 3535 | if (const VariableArrayType *vla |
| 3536 | = CGF.getContext().getAsVariableArrayType(elementType)) { |
| 3537 | auto VlaSize = CGF.getVLASize(vla); |
| 3538 | elementType = VlaSize.Type; |
| 3539 | divisor = VlaSize.NumElts; |
| 3540 | |
| 3541 | // Scale the number of non-VLA elements by the non-VLA element size. |
| 3542 | CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType); |
| 3543 | if (!eltSize.isOne()) |
| 3544 | divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor); |
| 3545 | |
| 3546 | // For everything elese, we can just compute it, safe in the |
| 3547 | // assumption that Sema won't let anything through that we can't |
| 3548 | // safely compute the size of. |
| 3549 | } else { |
| 3550 | CharUnits elementSize; |
| 3551 | // Handle GCC extension for pointer arithmetic on void* and |
| 3552 | // function pointer types. |
| 3553 | if (elementType->isVoidType() || elementType->isFunctionType()) |
| 3554 | elementSize = CharUnits::One(); |
| 3555 | else |
| 3556 | elementSize = CGF.getContext().getTypeSizeInChars(elementType); |
| 3557 | |
| 3558 | // Don't even emit the divide for element size of 1. |
| 3559 | if (elementSize.isOne()) |
| 3560 | return diffInChars; |
| 3561 | |
| 3562 | divisor = CGF.CGM.getSize(elementSize); |
| 3563 | } |
| 3564 | |
| 3565 | // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since |
| 3566 | // pointer difference in C is only defined in the case where both operands |
| 3567 | // are pointing to elements of an array. |
| 3568 | return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div"); |
| 3569 | } |
| 3570 | |
| 3571 | Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) { |
| 3572 | llvm::IntegerType *Ty; |
| 3573 | if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType())) |
| 3574 | Ty = cast<llvm::IntegerType>(VT->getElementType()); |
| 3575 | else |
| 3576 | Ty = cast<llvm::IntegerType>(LHS->getType()); |
| 3577 | return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1); |
| 3578 | } |
| 3579 | |
| 3580 | Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) { |
| 3581 | // LLVM requires the LHS and RHS to be the same type: promote or truncate the |
| 3582 | // RHS to the same size as the LHS. |
| 3583 | Value *RHS = Ops.RHS; |
| 3584 | if (Ops.LHS->getType() != RHS->getType()) |
| 3585 | RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom"); |
| 3586 | |
| 3587 | bool SanitizeBase = CGF.SanOpts.has(SanitizerKind::ShiftBase) && |
| 3588 | Ops.Ty->hasSignedIntegerRepresentation() && |
| 3589 | !CGF.getLangOpts().isSignedOverflowDefined() && |
| 3590 | !CGF.getLangOpts().CPlusPlus2a; |
| 3591 | bool SanitizeExponent = CGF.SanOpts.has(SanitizerKind::ShiftExponent); |
| 3592 | // OpenCL 6.3j: shift values are effectively % word size of LHS. |
| 3593 | if (CGF.getLangOpts().OpenCL) |
| 3594 | RHS = |
| 3595 | Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask"); |
| 3596 | else if ((SanitizeBase || SanitizeExponent) && |
| 3597 | isa<llvm::IntegerType>(Ops.LHS->getType())) { |
| 3598 | CodeGenFunction::SanitizerScope SanScope(&CGF); |
| 3599 | SmallVector<std::pair<Value *, SanitizerMask>, 2> Checks; |
| 3600 | llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, Ops.RHS); |
| 3601 | llvm::Value *ValidExponent = Builder.CreateICmpULE(Ops.RHS, WidthMinusOne); |
| 3602 | |
| 3603 | if (SanitizeExponent) { |
| 3604 | Checks.push_back( |
| 3605 | std::make_pair(ValidExponent, SanitizerKind::ShiftExponent)); |
| 3606 | } |
| 3607 | |
| 3608 | if (SanitizeBase) { |
| 3609 | // Check whether we are shifting any non-zero bits off the top of the |
| 3610 | // integer. We only emit this check if exponent is valid - otherwise |
| 3611 | // instructions below will have undefined behavior themselves. |
| 3612 | llvm::BasicBlock *Orig = Builder.GetInsertBlock(); |
| 3613 | llvm::BasicBlock *Cont = CGF.createBasicBlock("cont"); |
| 3614 | llvm::BasicBlock *CheckShiftBase = CGF.createBasicBlock("check"); |
| 3615 | Builder.CreateCondBr(ValidExponent, CheckShiftBase, Cont); |
| 3616 | llvm::Value *PromotedWidthMinusOne = |
| 3617 | (RHS == Ops.RHS) ? WidthMinusOne |
| 3618 | : GetWidthMinusOneValue(Ops.LHS, RHS); |
| 3619 | CGF.EmitBlock(CheckShiftBase); |
| 3620 | llvm::Value *BitsShiftedOff = Builder.CreateLShr( |
| 3621 | Ops.LHS, Builder.CreateSub(PromotedWidthMinusOne, RHS, "shl.zeros", |
| 3622 | /*NUW*/ true, /*NSW*/ true), |
| 3623 | "shl.check"); |
| 3624 | if (CGF.getLangOpts().CPlusPlus) { |
| 3625 | // In C99, we are not permitted to shift a 1 bit into the sign bit. |
| 3626 | // Under C++11's rules, shifting a 1 bit into the sign bit is |
| 3627 | // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't |
| 3628 | // define signed left shifts, so we use the C99 and C++11 rules there). |
| 3629 | llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1); |
| 3630 | BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One); |
| 3631 | } |
| 3632 | llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0); |
| 3633 | llvm::Value *ValidBase = Builder.CreateICmpEQ(BitsShiftedOff, Zero); |
| 3634 | CGF.EmitBlock(Cont); |
| 3635 | llvm::PHINode *BaseCheck = Builder.CreatePHI(ValidBase->getType(), 2); |
| 3636 | BaseCheck->addIncoming(Builder.getTrue(), Orig); |
| 3637 | BaseCheck->addIncoming(ValidBase, CheckShiftBase); |
| 3638 | Checks.push_back(std::make_pair(BaseCheck, SanitizerKind::ShiftBase)); |
| 3639 | } |
| 3640 | |
| 3641 | assert(!Checks.empty())((!Checks.empty()) ? static_cast<void> (0) : __assert_fail ("!Checks.empty()", "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3641, __PRETTY_FUNCTION__)); |
| 3642 | EmitBinOpCheck(Checks, Ops); |
| 3643 | } |
| 3644 | |
| 3645 | return Builder.CreateShl(Ops.LHS, RHS, "shl"); |
| 3646 | } |
| 3647 | |
| 3648 | Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) { |
| 3649 | // LLVM requires the LHS and RHS to be the same type: promote or truncate the |
| 3650 | // RHS to the same size as the LHS. |
| 3651 | Value *RHS = Ops.RHS; |
| 3652 | if (Ops.LHS->getType() != RHS->getType()) |
| 3653 | RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom"); |
| 3654 | |
| 3655 | // OpenCL 6.3j: shift values are effectively % word size of LHS. |
| 3656 | if (CGF.getLangOpts().OpenCL) |
| 3657 | RHS = |
| 3658 | Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask"); |
| 3659 | else if (CGF.SanOpts.has(SanitizerKind::ShiftExponent) && |
| 3660 | isa<llvm::IntegerType>(Ops.LHS->getType())) { |
| 3661 | CodeGenFunction::SanitizerScope SanScope(&CGF); |
| 3662 | llvm::Value *Valid = |
| 3663 | Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS)); |
| 3664 | EmitBinOpCheck(std::make_pair(Valid, SanitizerKind::ShiftExponent), Ops); |
| 3665 | } |
| 3666 | |
| 3667 | if (Ops.Ty->hasUnsignedIntegerRepresentation()) |
| 3668 | return Builder.CreateLShr(Ops.LHS, RHS, "shr"); |
| 3669 | return Builder.CreateAShr(Ops.LHS, RHS, "shr"); |
| 3670 | } |
| 3671 | |
| 3672 | enum IntrinsicType { VCMPEQ, VCMPGT }; |
| 3673 | // return corresponding comparison intrinsic for given vector type |
| 3674 | static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT, |
| 3675 | BuiltinType::Kind ElemKind) { |
| 3676 | switch (ElemKind) { |
| 3677 | default: llvm_unreachable("unexpected element type")::llvm::llvm_unreachable_internal("unexpected element type", "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3677); |
| 3678 | case BuiltinType::Char_U: |
| 3679 | case BuiltinType::UChar: |
| 3680 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p : |
| 3681 | llvm::Intrinsic::ppc_altivec_vcmpgtub_p; |
| 3682 | case BuiltinType::Char_S: |
| 3683 | case BuiltinType::SChar: |
| 3684 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p : |
| 3685 | llvm::Intrinsic::ppc_altivec_vcmpgtsb_p; |
| 3686 | case BuiltinType::UShort: |
| 3687 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p : |
| 3688 | llvm::Intrinsic::ppc_altivec_vcmpgtuh_p; |
| 3689 | case BuiltinType::Short: |
| 3690 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p : |
| 3691 | llvm::Intrinsic::ppc_altivec_vcmpgtsh_p; |
| 3692 | case BuiltinType::UInt: |
| 3693 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p : |
| 3694 | llvm::Intrinsic::ppc_altivec_vcmpgtuw_p; |
| 3695 | case BuiltinType::Int: |
| 3696 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p : |
| 3697 | llvm::Intrinsic::ppc_altivec_vcmpgtsw_p; |
| 3698 | case BuiltinType::ULong: |
| 3699 | case BuiltinType::ULongLong: |
| 3700 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequd_p : |
| 3701 | llvm::Intrinsic::ppc_altivec_vcmpgtud_p; |
| 3702 | case BuiltinType::Long: |
| 3703 | case BuiltinType::LongLong: |
| 3704 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequd_p : |
| 3705 | llvm::Intrinsic::ppc_altivec_vcmpgtsd_p; |
| 3706 | case BuiltinType::Float: |
| 3707 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p : |
| 3708 | llvm::Intrinsic::ppc_altivec_vcmpgtfp_p; |
| 3709 | case BuiltinType::Double: |
| 3710 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_vsx_xvcmpeqdp_p : |
| 3711 | llvm::Intrinsic::ppc_vsx_xvcmpgtdp_p; |
| 3712 | } |
| 3713 | } |
| 3714 | |
| 3715 | Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E, |
| 3716 | llvm::CmpInst::Predicate UICmpOpc, |
| 3717 | llvm::CmpInst::Predicate SICmpOpc, |
| 3718 | llvm::CmpInst::Predicate FCmpOpc) { |
| 3719 | TestAndClearIgnoreResultAssign(); |
| 3720 | Value *Result; |
| 3721 | QualType LHSTy = E->getLHS()->getType(); |
| 3722 | QualType RHSTy = E->getRHS()->getType(); |
| 3723 | if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) { |
| 3724 | assert(E->getOpcode() == BO_EQ ||((E->getOpcode() == BO_EQ || E->getOpcode() == BO_NE) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_EQ || E->getOpcode() == BO_NE" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3725, __PRETTY_FUNCTION__)) |
| 3725 | E->getOpcode() == BO_NE)((E->getOpcode() == BO_EQ || E->getOpcode() == BO_NE) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_EQ || E->getOpcode() == BO_NE" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3725, __PRETTY_FUNCTION__)); |
| 3726 | Value *LHS = CGF.EmitScalarExpr(E->getLHS()); |
| 3727 | Value *RHS = CGF.EmitScalarExpr(E->getRHS()); |
| 3728 | Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison( |
| 3729 | CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE); |
| 3730 | } else if (!LHSTy->isAnyComplexType() && !RHSTy->isAnyComplexType()) { |
| 3731 | BinOpInfo BOInfo = EmitBinOps(E); |
| 3732 | Value *LHS = BOInfo.LHS; |
| 3733 | Value *RHS = BOInfo.RHS; |
| 3734 | |
| 3735 | // If AltiVec, the comparison results in a numeric type, so we use |
| 3736 | // intrinsics comparing vectors and giving 0 or 1 as a result |
| 3737 | if (LHSTy->isVectorType() && !E->getType()->isVectorType()) { |
| 3738 | // constants for mapping CR6 register bits to predicate result |
| 3739 | enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6; |
| 3740 | |
| 3741 | llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic; |
| 3742 | |
| 3743 | // in several cases vector arguments order will be reversed |
| 3744 | Value *FirstVecArg = LHS, |
| 3745 | *SecondVecArg = RHS; |
| 3746 | |
| 3747 | QualType ElTy = LHSTy->castAs<VectorType>()->getElementType(); |
| 3748 | const BuiltinType *BTy = ElTy->getAs<BuiltinType>(); |
| 3749 | BuiltinType::Kind ElementKind = BTy->getKind(); |
| 3750 | |
| 3751 | switch(E->getOpcode()) { |
| 3752 | default: llvm_unreachable("is not a comparison operation")::llvm::llvm_unreachable_internal("is not a comparison operation" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3752); |
| 3753 | case BO_EQ: |
| 3754 | CR6 = CR6_LT; |
| 3755 | ID = GetIntrinsic(VCMPEQ, ElementKind); |
| 3756 | break; |
| 3757 | case BO_NE: |
| 3758 | CR6 = CR6_EQ; |
| 3759 | ID = GetIntrinsic(VCMPEQ, ElementKind); |
| 3760 | break; |
| 3761 | case BO_LT: |
| 3762 | CR6 = CR6_LT; |
| 3763 | ID = GetIntrinsic(VCMPGT, ElementKind); |
| 3764 | std::swap(FirstVecArg, SecondVecArg); |
| 3765 | break; |
| 3766 | case BO_GT: |
| 3767 | CR6 = CR6_LT; |
| 3768 | ID = GetIntrinsic(VCMPGT, ElementKind); |
| 3769 | break; |
| 3770 | case BO_LE: |
| 3771 | if (ElementKind == BuiltinType::Float) { |
| 3772 | CR6 = CR6_LT; |
| 3773 | ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p; |
| 3774 | std::swap(FirstVecArg, SecondVecArg); |
| 3775 | } |
| 3776 | else { |
| 3777 | CR6 = CR6_EQ; |
| 3778 | ID = GetIntrinsic(VCMPGT, ElementKind); |
| 3779 | } |
| 3780 | break; |
| 3781 | case BO_GE: |
| 3782 | if (ElementKind == BuiltinType::Float) { |
| 3783 | CR6 = CR6_LT; |
| 3784 | ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p; |
| 3785 | } |
| 3786 | else { |
| 3787 | CR6 = CR6_EQ; |
| 3788 | ID = GetIntrinsic(VCMPGT, ElementKind); |
| 3789 | std::swap(FirstVecArg, SecondVecArg); |
| 3790 | } |
| 3791 | break; |
| 3792 | } |
| 3793 | |
| 3794 | Value *CR6Param = Builder.getInt32(CR6); |
| 3795 | llvm::Function *F = CGF.CGM.getIntrinsic(ID); |
| 3796 | Result = Builder.CreateCall(F, {CR6Param, FirstVecArg, SecondVecArg}); |
| 3797 | |
| 3798 | // The result type of intrinsic may not be same as E->getType(). |
| 3799 | // If E->getType() is not BoolTy, EmitScalarConversion will do the |
| 3800 | // conversion work. If E->getType() is BoolTy, EmitScalarConversion will |
| 3801 | // do nothing, if ResultTy is not i1 at the same time, it will cause |
| 3802 | // crash later. |
| 3803 | llvm::IntegerType *ResultTy = cast<llvm::IntegerType>(Result->getType()); |
| 3804 | if (ResultTy->getBitWidth() > 1 && |
| 3805 | E->getType() == CGF.getContext().BoolTy) |
| 3806 | Result = Builder.CreateTrunc(Result, Builder.getInt1Ty()); |
| 3807 | return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(), |
| 3808 | E->getExprLoc()); |
| 3809 | } |
| 3810 | |
| 3811 | if (BOInfo.isFixedPointBinOp()) { |
| 3812 | Result = EmitFixedPointBinOp(BOInfo); |
| 3813 | } else if (LHS->getType()->isFPOrFPVectorTy()) { |
| 3814 | Result = Builder.CreateFCmp(FCmpOpc, LHS, RHS, "cmp"); |
| 3815 | } else if (LHSTy->hasSignedIntegerRepresentation()) { |
| 3816 | Result = Builder.CreateICmp(SICmpOpc, LHS, RHS, "cmp"); |
| 3817 | } else { |
| 3818 | // Unsigned integers and pointers. |
| 3819 | |
| 3820 | if (CGF.CGM.getCodeGenOpts().StrictVTablePointers && |
| 3821 | !isa<llvm::ConstantPointerNull>(LHS) && |
| 3822 | !isa<llvm::ConstantPointerNull>(RHS)) { |
| 3823 | |
| 3824 | // Dynamic information is required to be stripped for comparisons, |
| 3825 | // because it could leak the dynamic information. Based on comparisons |
| 3826 | // of pointers to dynamic objects, the optimizer can replace one pointer |
| 3827 | // with another, which might be incorrect in presence of invariant |
| 3828 | // groups. Comparison with null is safe because null does not carry any |
| 3829 | // dynamic information. |
| 3830 | if (LHSTy.mayBeDynamicClass()) |
| 3831 | LHS = Builder.CreateStripInvariantGroup(LHS); |
| 3832 | if (RHSTy.mayBeDynamicClass()) |
| 3833 | RHS = Builder.CreateStripInvariantGroup(RHS); |
| 3834 | } |
| 3835 | |
| 3836 | Result = Builder.CreateICmp(UICmpOpc, LHS, RHS, "cmp"); |
| 3837 | } |
| 3838 | |
| 3839 | // If this is a vector comparison, sign extend the result to the appropriate |
| 3840 | // vector integer type and return it (don't convert to bool). |
| 3841 | if (LHSTy->isVectorType()) |
| 3842 | return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext"); |
| 3843 | |
| 3844 | } else { |
| 3845 | // Complex Comparison: can only be an equality comparison. |
| 3846 | CodeGenFunction::ComplexPairTy LHS, RHS; |
| 3847 | QualType CETy; |
| 3848 | if (auto *CTy = LHSTy->getAs<ComplexType>()) { |
| 3849 | LHS = CGF.EmitComplexExpr(E->getLHS()); |
| 3850 | CETy = CTy->getElementType(); |
| 3851 | } else { |
| 3852 | LHS.first = Visit(E->getLHS()); |
| 3853 | LHS.second = llvm::Constant::getNullValue(LHS.first->getType()); |
| 3854 | CETy = LHSTy; |
| 3855 | } |
| 3856 | if (auto *CTy = RHSTy->getAs<ComplexType>()) { |
| 3857 | RHS = CGF.EmitComplexExpr(E->getRHS()); |
| 3858 | assert(CGF.getContext().hasSameUnqualifiedType(CETy,((CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType ()) && "The element types must always match.") ? static_cast <void> (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType()) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3860, __PRETTY_FUNCTION__)) |
| 3859 | CTy->getElementType()) &&((CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType ()) && "The element types must always match.") ? static_cast <void> (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType()) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3860, __PRETTY_FUNCTION__)) |
| 3860 | "The element types must always match.")((CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType ()) && "The element types must always match.") ? static_cast <void> (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType()) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3860, __PRETTY_FUNCTION__)); |
| 3861 | (void)CTy; |
| 3862 | } else { |
| 3863 | RHS.first = Visit(E->getRHS()); |
| 3864 | RHS.second = llvm::Constant::getNullValue(RHS.first->getType()); |
| 3865 | assert(CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) &&((CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) && "The element types must always match.") ? static_cast<void > (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3866, __PRETTY_FUNCTION__)) |
| 3866 | "The element types must always match.")((CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) && "The element types must always match.") ? static_cast<void > (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3866, __PRETTY_FUNCTION__)); |
| 3867 | } |
| 3868 | |
| 3869 | Value *ResultR, *ResultI; |
| 3870 | if (CETy->isRealFloatingType()) { |
| 3871 | ResultR = Builder.CreateFCmp(FCmpOpc, LHS.first, RHS.first, "cmp.r"); |
| 3872 | ResultI = Builder.CreateFCmp(FCmpOpc, LHS.second, RHS.second, "cmp.i"); |
| 3873 | } else { |
| 3874 | // Complex comparisons can only be equality comparisons. As such, signed |
| 3875 | // and unsigned opcodes are the same. |
| 3876 | ResultR = Builder.CreateICmp(UICmpOpc, LHS.first, RHS.first, "cmp.r"); |
| 3877 | ResultI = Builder.CreateICmp(UICmpOpc, LHS.second, RHS.second, "cmp.i"); |
| 3878 | } |
| 3879 | |
| 3880 | if (E->getOpcode() == BO_EQ) { |
| 3881 | Result = Builder.CreateAnd(ResultR, ResultI, "and.ri"); |
| 3882 | } else { |
| 3883 | assert(E->getOpcode() == BO_NE &&((E->getOpcode() == BO_NE && "Complex comparison other than == or != ?" ) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_NE && \"Complex comparison other than == or != ?\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3884, __PRETTY_FUNCTION__)) |
| 3884 | "Complex comparison other than == or != ?")((E->getOpcode() == BO_NE && "Complex comparison other than == or != ?" ) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_NE && \"Complex comparison other than == or != ?\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3884, __PRETTY_FUNCTION__)); |
| 3885 | Result = Builder.CreateOr(ResultR, ResultI, "or.ri"); |
| 3886 | } |
| 3887 | } |
| 3888 | |
| 3889 | return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(), |
| 3890 | E->getExprLoc()); |
| 3891 | } |
| 3892 | |
| 3893 | Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) { |
| 3894 | bool Ignore = TestAndClearIgnoreResultAssign(); |
| 3895 | |
| 3896 | Value *RHS; |
| 3897 | LValue LHS; |
| 3898 | |
| 3899 | switch (E->getLHS()->getType().getObjCLifetime()) { |
| 3900 | case Qualifiers::OCL_Strong: |
| 3901 | std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore); |
| 3902 | break; |
| 3903 | |
| 3904 | case Qualifiers::OCL_Autoreleasing: |
| 3905 | std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E); |
| 3906 | break; |
| 3907 | |
| 3908 | case Qualifiers::OCL_ExplicitNone: |
| 3909 | std::tie(LHS, RHS) = CGF.EmitARCStoreUnsafeUnretained(E, Ignore); |
| 3910 | break; |
| 3911 | |
| 3912 | case Qualifiers::OCL_Weak: |
| 3913 | RHS = Visit(E->getRHS()); |
| 3914 | LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store); |
| 3915 | RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore); |
| 3916 | break; |
| 3917 | |
| 3918 | case Qualifiers::OCL_None: |
| 3919 | // __block variables need to have the rhs evaluated first, plus |
| 3920 | // this should improve codegen just a little. |
| 3921 | RHS = Visit(E->getRHS()); |
| 3922 | LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store); |
| 3923 | |
| 3924 | // Store the value into the LHS. Bit-fields are handled specially |
| 3925 | // because the result is altered by the store, i.e., [C99 6.5.16p1] |
| 3926 | // 'An assignment expression has the value of the left operand after |
| 3927 | // the assignment...'. |
| 3928 | if (LHS.isBitField()) { |
| 3929 | CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS); |
| 3930 | } else { |
| 3931 | CGF.EmitNullabilityCheck(LHS, RHS, E->getExprLoc()); |
| 3932 | CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS); |
| 3933 | } |
| 3934 | } |
| 3935 | |
| 3936 | // If the result is clearly ignored, return now. |
| 3937 | if (Ignore) |
| 3938 | return nullptr; |
| 3939 | |
| 3940 | // The result of an assignment in C is the assigned r-value. |
| 3941 | if (!CGF.getLangOpts().CPlusPlus) |
| 3942 | return RHS; |
| 3943 | |
| 3944 | // If the lvalue is non-volatile, return the computed value of the assignment. |
| 3945 | if (!LHS.isVolatileQualified()) |
| 3946 | return RHS; |
| 3947 | |
| 3948 | // Otherwise, reload the value. |
| 3949 | return EmitLoadOfLValue(LHS, E->getExprLoc()); |
| 3950 | } |
| 3951 | |
| 3952 | Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) { |
| 3953 | // Perform vector logical and on comparisons with zero vectors. |
| 3954 | if (E->getType()->isVectorType()) { |
| 3955 | CGF.incrementProfileCounter(E); |
| 3956 | |
| 3957 | Value *LHS = Visit(E->getLHS()); |
| 3958 | Value *RHS = Visit(E->getRHS()); |
| 3959 | Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType()); |
| 3960 | if (LHS->getType()->isFPOrFPVectorTy()) { |
| 3961 | LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp"); |
| 3962 | RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp"); |
| 3963 | } else { |
| 3964 | LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp"); |
| 3965 | RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp"); |
| 3966 | } |
| 3967 | Value *And = Builder.CreateAnd(LHS, RHS); |
| 3968 | return Builder.CreateSExt(And, ConvertType(E->getType()), "sext"); |
| 3969 | } |
| 3970 | |
| 3971 | llvm::Type *ResTy = ConvertType(E->getType()); |
| 3972 | |
| 3973 | // If we have 0 && RHS, see if we can elide RHS, if so, just return 0. |
| 3974 | // If we have 1 && X, just emit X without inserting the control flow. |
| 3975 | bool LHSCondVal; |
| 3976 | if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) { |
| 3977 | if (LHSCondVal) { // If we have 1 && X, just emit X. |
| 3978 | CGF.incrementProfileCounter(E); |
| 3979 | |
| 3980 | Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); |
| 3981 | // ZExt result to int or bool. |
| 3982 | return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext"); |
| 3983 | } |
| 3984 | |
| 3985 | // 0 && RHS: If it is safe, just elide the RHS, and return 0/false. |
| 3986 | if (!CGF.ContainsLabel(E->getRHS())) |
| 3987 | return llvm::Constant::getNullValue(ResTy); |
| 3988 | } |
| 3989 | |
| 3990 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end"); |
| 3991 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs"); |
| 3992 | |
| 3993 | CodeGenFunction::ConditionalEvaluation eval(CGF); |
| 3994 | |
| 3995 | // Branch on the LHS first. If it is false, go to the failure (cont) block. |
| 3996 | CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock, |
| 3997 | CGF.getProfileCount(E->getRHS())); |
| 3998 | |
| 3999 | // Any edges into the ContBlock are now from an (indeterminate number of) |
| 4000 | // edges from this first condition. All of these values will be false. Start |
| 4001 | // setting up the PHI node in the Cont Block for this. |
| 4002 | llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2, |
| 4003 | "", ContBlock); |
| 4004 | for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock); |
| 4005 | PI != PE; ++PI) |
| 4006 | PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI); |
| 4007 | |
| 4008 | eval.begin(CGF); |
| 4009 | CGF.EmitBlock(RHSBlock); |
| 4010 | CGF.incrementProfileCounter(E); |
| 4011 | Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); |
| 4012 | eval.end(CGF); |
| 4013 | |
| 4014 | // Reaquire the RHS block, as there may be subblocks inserted. |
| 4015 | RHSBlock = Builder.GetInsertBlock(); |
| 4016 | |
| 4017 | // Emit an unconditional branch from this block to ContBlock. |
| 4018 | { |
| 4019 | // There is no need to emit line number for unconditional branch. |
| 4020 | auto NL = ApplyDebugLocation::CreateEmpty(CGF); |
| 4021 | CGF.EmitBlock(ContBlock); |
| 4022 | } |
| 4023 | // Insert an entry into the phi node for the edge with the value of RHSCond. |
| 4024 | PN->addIncoming(RHSCond, RHSBlock); |
| 4025 | |
| 4026 | // Artificial location to preserve the scope information |
| 4027 | { |
| 4028 | auto NL = ApplyDebugLocation::CreateArtificial(CGF); |
| 4029 | PN->setDebugLoc(Builder.getCurrentDebugLocation()); |
| 4030 | } |
| 4031 | |
| 4032 | // ZExt result to int. |
| 4033 | return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext"); |
| 4034 | } |
| 4035 | |
| 4036 | Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) { |
| 4037 | // Perform vector logical or on comparisons with zero vectors. |
| 4038 | if (E->getType()->isVectorType()) { |
| 4039 | CGF.incrementProfileCounter(E); |
| 4040 | |
| 4041 | Value *LHS = Visit(E->getLHS()); |
| 4042 | Value *RHS = Visit(E->getRHS()); |
| 4043 | Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType()); |
| 4044 | if (LHS->getType()->isFPOrFPVectorTy()) { |
| 4045 | LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp"); |
| 4046 | RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp"); |
| 4047 | } else { |
| 4048 | LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp"); |
| 4049 | RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp"); |
| 4050 | } |
| 4051 | Value *Or = Builder.CreateOr(LHS, RHS); |
| 4052 | return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext"); |
| 4053 | } |
| 4054 | |
| 4055 | llvm::Type *ResTy = ConvertType(E->getType()); |
| 4056 | |
| 4057 | // If we have 1 || RHS, see if we can elide RHS, if so, just return 1. |
| 4058 | // If we have 0 || X, just emit X without inserting the control flow. |
| 4059 | bool LHSCondVal; |
| 4060 | if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) { |
| 4061 | if (!LHSCondVal) { // If we have 0 || X, just emit X. |
| 4062 | CGF.incrementProfileCounter(E); |
| 4063 | |
| 4064 | Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); |
| 4065 | // ZExt result to int or bool. |
| 4066 | return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext"); |
| 4067 | } |
| 4068 | |
| 4069 | // 1 || RHS: If it is safe, just elide the RHS, and return 1/true. |
| 4070 | if (!CGF.ContainsLabel(E->getRHS())) |
| 4071 | return llvm::ConstantInt::get(ResTy, 1); |
| 4072 | } |
| 4073 | |
| 4074 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end"); |
| 4075 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs"); |
| 4076 | |
| 4077 | CodeGenFunction::ConditionalEvaluation eval(CGF); |
| 4078 | |
| 4079 | // Branch on the LHS first. If it is true, go to the success (cont) block. |
| 4080 | CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock, |
| 4081 | CGF.getCurrentProfileCount() - |
| 4082 | CGF.getProfileCount(E->getRHS())); |
| 4083 | |
| 4084 | // Any edges into the ContBlock are now from an (indeterminate number of) |
| 4085 | // edges from this first condition. All of these values will be true. Start |
| 4086 | // setting up the PHI node in the Cont Block for this. |
| 4087 | llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2, |
| 4088 | "", ContBlock); |
| 4089 | for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock); |
| 4090 | PI != PE; ++PI) |
| 4091 | PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI); |
| 4092 | |
| 4093 | eval.begin(CGF); |
| 4094 | |
| 4095 | // Emit the RHS condition as a bool value. |
| 4096 | CGF.EmitBlock(RHSBlock); |
| 4097 | CGF.incrementProfileCounter(E); |
| 4098 | Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); |
| 4099 | |
| 4100 | eval.end(CGF); |
| 4101 | |
| 4102 | // Reaquire the RHS block, as there may be subblocks inserted. |
| 4103 | RHSBlock = Builder.GetInsertBlock(); |
| 4104 | |
| 4105 | // Emit an unconditional branch from this block to ContBlock. Insert an entry |
| 4106 | // into the phi node for the edge with the value of RHSCond. |
| 4107 | CGF.EmitBlock(ContBlock); |
| 4108 | PN->addIncoming(RHSCond, RHSBlock); |
| 4109 | |
| 4110 | // ZExt result to int. |
| 4111 | return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext"); |
| 4112 | } |
| 4113 | |
| 4114 | Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) { |
| 4115 | CGF.EmitIgnoredExpr(E->getLHS()); |
| 4116 | CGF.EnsureInsertPoint(); |
| 4117 | return Visit(E->getRHS()); |
| 4118 | } |
| 4119 | |
| 4120 | //===----------------------------------------------------------------------===// |
| 4121 | // Other Operators |
| 4122 | //===----------------------------------------------------------------------===// |
| 4123 | |
| 4124 | /// isCheapEnoughToEvaluateUnconditionally - Return true if the specified |
| 4125 | /// expression is cheap enough and side-effect-free enough to evaluate |
| 4126 | /// unconditionally instead of conditionally. This is used to convert control |
| 4127 | /// flow into selects in some cases. |
| 4128 | static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E, |
| 4129 | CodeGenFunction &CGF) { |
| 4130 | // Anything that is an integer or floating point constant is fine. |
| 4131 | return E->IgnoreParens()->isEvaluatable(CGF.getContext()); |
| 4132 | |
| 4133 | // Even non-volatile automatic variables can't be evaluated unconditionally. |
| 4134 | // Referencing a thread_local may cause non-trivial initialization work to |
| 4135 | // occur. If we're inside a lambda and one of the variables is from the scope |
| 4136 | // outside the lambda, that function may have returned already. Reading its |
| 4137 | // locals is a bad idea. Also, these reads may introduce races there didn't |
| 4138 | // exist in the source-level program. |
| 4139 | } |
| 4140 | |
| 4141 | |
| 4142 | Value *ScalarExprEmitter:: |
| 4143 | VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { |
| 4144 | TestAndClearIgnoreResultAssign(); |
| 4145 | |
| 4146 | // Bind the common expression if necessary. |
| 4147 | CodeGenFunction::OpaqueValueMapping binding(CGF, E); |
| 4148 | |
| 4149 | Expr *condExpr = E->getCond(); |
| 4150 | Expr *lhsExpr = E->getTrueExpr(); |
| 4151 | Expr *rhsExpr = E->getFalseExpr(); |
| 4152 | |
| 4153 | // If the condition constant folds and can be elided, try to avoid emitting |
| 4154 | // the condition and the dead arm. |
| 4155 | bool CondExprBool; |
| 4156 | if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) { |
| 4157 | Expr *live = lhsExpr, *dead = rhsExpr; |
| 4158 | if (!CondExprBool) std::swap(live, dead); |
| 4159 | |
| 4160 | // If the dead side doesn't have labels we need, just emit the Live part. |
| 4161 | if (!CGF.ContainsLabel(dead)) { |
| 4162 | if (CondExprBool) |
| 4163 | CGF.incrementProfileCounter(E); |
| 4164 | Value *Result = Visit(live); |
| 4165 | |
| 4166 | // If the live part is a throw expression, it acts like it has a void |
| 4167 | // type, so evaluating it returns a null Value*. However, a conditional |
| 4168 | // with non-void type must return a non-null Value*. |
| 4169 | if (!Result && !E->getType()->isVoidType()) |
| 4170 | Result = llvm::UndefValue::get(CGF.ConvertType(E->getType())); |
| 4171 | |
| 4172 | return Result; |
| 4173 | } |
| 4174 | } |
| 4175 | |
| 4176 | // OpenCL: If the condition is a vector, we can treat this condition like |
| 4177 | // the select function. |
| 4178 | if (CGF.getLangOpts().OpenCL |
| 4179 | && condExpr->getType()->isVectorType()) { |
| 4180 | CGF.incrementProfileCounter(E); |
| 4181 | |
| 4182 | llvm::Value *CondV = CGF.EmitScalarExpr(condExpr); |
| 4183 | llvm::Value *LHS = Visit(lhsExpr); |
| 4184 | llvm::Value *RHS = Visit(rhsExpr); |
| 4185 | |
| 4186 | llvm::Type *condType = ConvertType(condExpr->getType()); |
| 4187 | llvm::VectorType *vecTy = cast<llvm::VectorType>(condType); |
| 4188 | |
| 4189 | unsigned numElem = vecTy->getNumElements(); |
| 4190 | llvm::Type *elemType = vecTy->getElementType(); |
| 4191 | |
| 4192 | llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy); |
| 4193 | llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec); |
| 4194 | llvm::Value *tmp = Builder.CreateSExt(TestMSB, |
| 4195 | llvm::VectorType::get(elemType, |
| 4196 | numElem), |
| 4197 | "sext"); |
| 4198 | llvm::Value *tmp2 = Builder.CreateNot(tmp); |
| 4199 | |
| 4200 | // Cast float to int to perform ANDs if necessary. |
| 4201 | llvm::Value *RHSTmp = RHS; |
| 4202 | llvm::Value *LHSTmp = LHS; |
| 4203 | bool wasCast = false; |
| 4204 | llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType()); |
| 4205 | if (rhsVTy->getElementType()->isFloatingPointTy()) { |
| 4206 | RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType()); |
| 4207 | LHSTmp = Builder.CreateBitCast(LHS, tmp->getType()); |
| 4208 | wasCast = true; |
| 4209 | } |
| 4210 | |
| 4211 | llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2); |
| 4212 | llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp); |
| 4213 | llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond"); |
| 4214 | if (wasCast) |
| 4215 | tmp5 = Builder.CreateBitCast(tmp5, RHS->getType()); |
| 4216 | |
| 4217 | return tmp5; |
| 4218 | } |
| 4219 | |
| 4220 | // If this is a really simple expression (like x ? 4 : 5), emit this as a |
| 4221 | // select instead of as control flow. We can only do this if it is cheap and |
| 4222 | // safe to evaluate the LHS and RHS unconditionally. |
| 4223 | if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) && |
| 4224 | isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) { |
| 4225 | llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr); |
| 4226 | llvm::Value *StepV = Builder.CreateZExtOrBitCast(CondV, CGF.Int64Ty); |
| 4227 | |
| 4228 | CGF.incrementProfileCounter(E, StepV); |
| 4229 | |
| 4230 | llvm::Value *LHS = Visit(lhsExpr); |
| 4231 | llvm::Value *RHS = Visit(rhsExpr); |
| 4232 | if (!LHS) { |
| 4233 | // If the conditional has void type, make sure we return a null Value*. |
| 4234 | assert(!RHS && "LHS and RHS types must match")((!RHS && "LHS and RHS types must match") ? static_cast <void> (0) : __assert_fail ("!RHS && \"LHS and RHS types must match\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4234, __PRETTY_FUNCTION__)); |
| 4235 | return nullptr; |
| 4236 | } |
| 4237 | return Builder.CreateSelect(CondV, LHS, RHS, "cond"); |
| 4238 | } |
| 4239 | |
| 4240 | llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); |
| 4241 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); |
| 4242 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); |
| 4243 | |
| 4244 | CodeGenFunction::ConditionalEvaluation eval(CGF); |
| 4245 | CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock, |
| 4246 | CGF.getProfileCount(lhsExpr)); |
| 4247 | |
| 4248 | CGF.EmitBlock(LHSBlock); |
| 4249 | CGF.incrementProfileCounter(E); |
| 4250 | eval.begin(CGF); |
| 4251 | Value *LHS = Visit(lhsExpr); |
| 4252 | eval.end(CGF); |
| 4253 | |
| 4254 | LHSBlock = Builder.GetInsertBlock(); |
| 4255 | Builder.CreateBr(ContBlock); |
| 4256 | |
| 4257 | CGF.EmitBlock(RHSBlock); |
| 4258 | eval.begin(CGF); |
| 4259 | Value *RHS = Visit(rhsExpr); |
| 4260 | eval.end(CGF); |
| 4261 | |
| 4262 | RHSBlock = Builder.GetInsertBlock(); |
| 4263 | CGF.EmitBlock(ContBlock); |
| 4264 | |
| 4265 | // If the LHS or RHS is a throw expression, it will be legitimately null. |
| 4266 | if (!LHS) |
| 4267 | return RHS; |
| 4268 | if (!RHS) |
| 4269 | return LHS; |
| 4270 | |
| 4271 | // Create a PHI node for the real part. |
| 4272 | llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond"); |
| 4273 | PN->addIncoming(LHS, LHSBlock); |
| 4274 | PN->addIncoming(RHS, RHSBlock); |
| 4275 | return PN; |
| 4276 | } |
| 4277 | |
| 4278 | Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) { |
| 4279 | return Visit(E->getChosenSubExpr()); |
| 4280 | } |
| 4281 | |
| 4282 | Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { |
| 4283 | QualType Ty = VE->getType(); |
| 4284 | |
| 4285 | if (Ty->isVariablyModifiedType()) |
| 4286 | CGF.EmitVariablyModifiedType(Ty); |
| 4287 | |
| 4288 | Address ArgValue = Address::invalid(); |
| 4289 | Address ArgPtr = CGF.EmitVAArg(VE, ArgValue); |
| 4290 | |
| 4291 | llvm::Type *ArgTy = ConvertType(VE->getType()); |
| 4292 | |
| 4293 | // If EmitVAArg fails, emit an error. |
| 4294 | if (!ArgPtr.isValid()) { |
| 4295 | CGF.ErrorUnsupported(VE, "va_arg expression"); |
| 4296 | return llvm::UndefValue::get(ArgTy); |
| 4297 | } |
| 4298 | |
| 4299 | // FIXME Volatility. |
| 4300 | llvm::Value *Val = Builder.CreateLoad(ArgPtr); |
| 4301 | |
| 4302 | // If EmitVAArg promoted the type, we must truncate it. |
| 4303 | if (ArgTy != Val->getType()) { |
| 4304 | if (ArgTy->isPointerTy() && !Val->getType()->isPointerTy()) |
| 4305 | Val = Builder.CreateIntToPtr(Val, ArgTy); |
| 4306 | else |
| 4307 | Val = Builder.CreateTrunc(Val, ArgTy); |
| 4308 | } |
| 4309 | |
| 4310 | return Val; |
| 4311 | } |
| 4312 | |
| 4313 | Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) { |
| 4314 | return CGF.EmitBlockLiteral(block); |
| 4315 | } |
| 4316 | |
| 4317 | // Convert a vec3 to vec4, or vice versa. |
| 4318 | static Value *ConvertVec3AndVec4(CGBuilderTy &Builder, CodeGenFunction &CGF, |
| 4319 | Value *Src, unsigned NumElementsDst) { |
| 4320 | llvm::Value *UnV = llvm::UndefValue::get(Src->getType()); |
| 4321 | SmallVector<llvm::Constant*, 4> Args; |
| 4322 | Args.push_back(Builder.getInt32(0)); |
| 4323 | Args.push_back(Builder.getInt32(1)); |
| 4324 | Args.push_back(Builder.getInt32(2)); |
| 4325 | if (NumElementsDst == 4) |
| 4326 | Args.push_back(llvm::UndefValue::get(CGF.Int32Ty)); |
| 4327 | llvm::Constant *Mask = llvm::ConstantVector::get(Args); |
| 4328 | return Builder.CreateShuffleVector(Src, UnV, Mask); |
| 4329 | } |
| 4330 | |
| 4331 | // Create cast instructions for converting LLVM value \p Src to LLVM type \p |
| 4332 | // DstTy. \p Src has the same size as \p DstTy. Both are single value types |
| 4333 | // but could be scalar or vectors of different lengths, and either can be |
| 4334 | // pointer. |
| 4335 | // There are 4 cases: |
| 4336 | // 1. non-pointer -> non-pointer : needs 1 bitcast |
| 4337 | // 2. pointer -> pointer : needs 1 bitcast or addrspacecast |
| 4338 | // 3. pointer -> non-pointer |
| 4339 | // a) pointer -> intptr_t : needs 1 ptrtoint |
| 4340 | // b) pointer -> non-intptr_t : needs 1 ptrtoint then 1 bitcast |
| 4341 | // 4. non-pointer -> pointer |
| 4342 | // a) intptr_t -> pointer : needs 1 inttoptr |
| 4343 | // b) non-intptr_t -> pointer : needs 1 bitcast then 1 inttoptr |
| 4344 | // Note: for cases 3b and 4b two casts are required since LLVM casts do not |
| 4345 | // allow casting directly between pointer types and non-integer non-pointer |
| 4346 | // types. |
| 4347 | static Value *createCastsForTypeOfSameSize(CGBuilderTy &Builder, |
| 4348 | const llvm::DataLayout &DL, |
| 4349 | Value *Src, llvm::Type *DstTy, |
| 4350 | StringRef Name = "") { |
| 4351 | auto SrcTy = Src->getType(); |
| 4352 | |
| 4353 | // Case 1. |
| 4354 | if (!SrcTy->isPointerTy() && !DstTy->isPointerTy()) |
| 4355 | return Builder.CreateBitCast(Src, DstTy, Name); |
| 4356 | |
| 4357 | // Case 2. |
| 4358 | if (SrcTy->isPointerTy() && DstTy->isPointerTy()) |
| 4359 | return Builder.CreatePointerBitCastOrAddrSpaceCast(Src, DstTy, Name); |
| 4360 | |
| 4361 | // Case 3. |
| 4362 | if (SrcTy->isPointerTy() && !DstTy->isPointerTy()) { |
| 4363 | // Case 3b. |
| 4364 | if (!DstTy->isIntegerTy()) |
| 4365 | Src = Builder.CreatePtrToInt(Src, DL.getIntPtrType(SrcTy)); |
| 4366 | // Cases 3a and 3b. |
| 4367 | return Builder.CreateBitOrPointerCast(Src, DstTy, Name); |
| 4368 | } |
| 4369 | |
| 4370 | // Case 4b. |
| 4371 | if (!SrcTy->isIntegerTy()) |
| 4372 | Src = Builder.CreateBitCast(Src, DL.getIntPtrType(DstTy)); |
| 4373 | // Cases 4a and 4b. |
| 4374 | return Builder.CreateIntToPtr(Src, DstTy, Name); |
| 4375 | } |
| 4376 | |
| 4377 | Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) { |
| 4378 | Value *Src = CGF.EmitScalarExpr(E->getSrcExpr()); |
| 4379 | llvm::Type *DstTy = ConvertType(E->getType()); |
| 4380 | |
| 4381 | llvm::Type *SrcTy = Src->getType(); |
| 4382 | unsigned NumElementsSrc = isa<llvm::VectorType>(SrcTy) ? |
| 4383 | cast<llvm::VectorType>(SrcTy)->getNumElements() : 0; |
| 4384 | unsigned NumElementsDst = isa<llvm::VectorType>(DstTy) ? |
| 4385 | cast<llvm::VectorType>(DstTy)->getNumElements() : 0; |
| 4386 | |
| 4387 | // Going from vec3 to non-vec3 is a special case and requires a shuffle |
| 4388 | // vector to get a vec4, then a bitcast if the target type is different. |
| 4389 | if (NumElementsSrc == 3 && NumElementsDst != 3) { |
| 4390 | Src = ConvertVec3AndVec4(Builder, CGF, Src, 4); |
| 4391 | |
| 4392 | if (!CGF.CGM.getCodeGenOpts().PreserveVec3Type) { |
| 4393 | Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src, |
| 4394 | DstTy); |
| 4395 | } |
| 4396 | |
| 4397 | Src->setName("astype"); |
| 4398 | return Src; |
| 4399 | } |
| 4400 | |
| 4401 | // Going from non-vec3 to vec3 is a special case and requires a bitcast |
| 4402 | // to vec4 if the original type is not vec4, then a shuffle vector to |
| 4403 | // get a vec3. |
| 4404 | if (NumElementsSrc != 3 && NumElementsDst == 3) { |
| 4405 | if (!CGF.CGM.getCodeGenOpts().PreserveVec3Type) { |
| 4406 | auto Vec4Ty = llvm::VectorType::get(DstTy->getVectorElementType(), 4); |
| 4407 | Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src, |
| 4408 | Vec4Ty); |
| 4409 | } |
| 4410 | |
| 4411 | Src = ConvertVec3AndVec4(Builder, CGF, Src, 3); |
| 4412 | Src->setName("astype"); |
| 4413 | return Src; |
| 4414 | } |
| 4415 | |
| 4416 | return Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), |
Although the value stored to 'Src' is used in the enclosing expression, the value is never actually read from 'Src' | |
| 4417 | Src, DstTy, "astype"); |
| 4418 | } |
| 4419 | |
| 4420 | Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) { |
| 4421 | return CGF.EmitAtomicExpr(E).getScalarVal(); |
| 4422 | } |
| 4423 | |
| 4424 | //===----------------------------------------------------------------------===// |
| 4425 | // Entry Point into this File |
| 4426 | //===----------------------------------------------------------------------===// |
| 4427 | |
| 4428 | /// Emit the computation of the specified expression of scalar type, ignoring |
| 4429 | /// the result. |
| 4430 | Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) { |
| 4431 | assert(E && hasScalarEvaluationKind(E->getType()) &&((E && hasScalarEvaluationKind(E->getType()) && "Invalid scalar expression to emit") ? static_cast<void> (0) : __assert_fail ("E && hasScalarEvaluationKind(E->getType()) && \"Invalid scalar expression to emit\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4432, __PRETTY_FUNCTION__)) |
| 4432 | "Invalid scalar expression to emit")((E && hasScalarEvaluationKind(E->getType()) && "Invalid scalar expression to emit") ? static_cast<void> (0) : __assert_fail ("E && hasScalarEvaluationKind(E->getType()) && \"Invalid scalar expression to emit\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4432, __PRETTY_FUNCTION__)); |
| 4433 | |
| 4434 | return ScalarExprEmitter(*this, IgnoreResultAssign) |
| 4435 | .Visit(const_cast<Expr *>(E)); |
| 4436 | } |
| 4437 | |
| 4438 | /// Emit a conversion from the specified type to the specified destination type, |
| 4439 | /// both of which are LLVM scalar types. |
| 4440 | Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy, |
| 4441 | QualType DstTy, |
| 4442 | SourceLocation Loc) { |
| 4443 | assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&((hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind (DstTy) && "Invalid scalar expression to emit") ? static_cast <void> (0) : __assert_fail ("hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) && \"Invalid scalar expression to emit\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4444, __PRETTY_FUNCTION__)) |
| 4444 | "Invalid scalar expression to emit")((hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind (DstTy) && "Invalid scalar expression to emit") ? static_cast <void> (0) : __assert_fail ("hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) && \"Invalid scalar expression to emit\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4444, __PRETTY_FUNCTION__)); |
| 4445 | return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy, Loc); |
| 4446 | } |
| 4447 | |
| 4448 | /// Emit a conversion from the specified complex type to the specified |
| 4449 | /// destination type, where the destination type is an LLVM scalar type. |
| 4450 | Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src, |
| 4451 | QualType SrcTy, |
| 4452 | QualType DstTy, |
| 4453 | SourceLocation Loc) { |
| 4454 | assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&((SrcTy->isAnyComplexType() && hasScalarEvaluationKind (DstTy) && "Invalid complex -> scalar conversion") ? static_cast<void> (0) : __assert_fail ("SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) && \"Invalid complex -> scalar conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4455, __PRETTY_FUNCTION__)) |
| 4455 | "Invalid complex -> scalar conversion")((SrcTy->isAnyComplexType() && hasScalarEvaluationKind (DstTy) && "Invalid complex -> scalar conversion") ? static_cast<void> (0) : __assert_fail ("SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) && \"Invalid complex -> scalar conversion\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4455, __PRETTY_FUNCTION__)); |
| 4456 | return ScalarExprEmitter(*this) |
| 4457 | .EmitComplexToScalarConversion(Src, SrcTy, DstTy, Loc); |
| 4458 | } |
| 4459 | |
| 4460 | |
| 4461 | llvm::Value *CodeGenFunction:: |
| 4462 | EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV, |
| 4463 | bool isInc, bool isPre) { |
| 4464 | return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre); |
| 4465 | } |
| 4466 | |
| 4467 | LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) { |
| 4468 | // object->isa or (*object).isa |
| 4469 | // Generate code as for: *(Class*)object |
| 4470 | |
| 4471 | Expr *BaseExpr = E->getBase(); |
| 4472 | Address Addr = Address::invalid(); |
| 4473 | if (BaseExpr->isRValue()) { |
| 4474 | Addr = Address(EmitScalarExpr(BaseExpr), getPointerAlign()); |
| 4475 | } else { |
| 4476 | Addr = EmitLValue(BaseExpr).getAddress(); |
| 4477 | } |
| 4478 | |
| 4479 | // Cast the address to Class*. |
| 4480 | Addr = Builder.CreateElementBitCast(Addr, ConvertType(E->getType())); |
| 4481 | return MakeAddrLValue(Addr, E->getType()); |
| 4482 | } |
| 4483 | |
| 4484 | |
| 4485 | LValue CodeGenFunction::EmitCompoundAssignmentLValue( |
| 4486 | const CompoundAssignOperator *E) { |
| 4487 | ScalarExprEmitter Scalar(*this); |
| 4488 | Value *Result = nullptr; |
| 4489 | switch (E->getOpcode()) { |
| 4490 | #define COMPOUND_OP(Op) \ |
| 4491 | case BO_##Op##Assign: \ |
| 4492 | return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \ |
| 4493 | Result) |
| 4494 | COMPOUND_OP(Mul); |
| 4495 | COMPOUND_OP(Div); |
| 4496 | COMPOUND_OP(Rem); |
| 4497 | COMPOUND_OP(Add); |
| 4498 | COMPOUND_OP(Sub); |
| 4499 | COMPOUND_OP(Shl); |
| 4500 | COMPOUND_OP(Shr); |
| 4501 | COMPOUND_OP(And); |
| 4502 | COMPOUND_OP(Xor); |
| 4503 | COMPOUND_OP(Or); |
| 4504 | #undef COMPOUND_OP |
| 4505 | |
| 4506 | case BO_PtrMemD: |
| 4507 | case BO_PtrMemI: |
| 4508 | case BO_Mul: |
| 4509 | case BO_Div: |
| 4510 | case BO_Rem: |
| 4511 | case BO_Add: |
| 4512 | case BO_Sub: |
| 4513 | case BO_Shl: |
| 4514 | case BO_Shr: |
| 4515 | case BO_LT: |
| 4516 | case BO_GT: |
| 4517 | case BO_LE: |
| 4518 | case BO_GE: |
| 4519 | case BO_EQ: |
| 4520 | case BO_NE: |
| 4521 | case BO_Cmp: |
| 4522 | case BO_And: |
| 4523 | case BO_Xor: |
| 4524 | case BO_Or: |
| 4525 | case BO_LAnd: |
| 4526 | case BO_LOr: |
| 4527 | case BO_Assign: |
| 4528 | case BO_Comma: |
| 4529 | llvm_unreachable("Not valid compound assignment operators")::llvm::llvm_unreachable_internal("Not valid compound assignment operators" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4529); |
| 4530 | } |
| 4531 | |
| 4532 | llvm_unreachable("Unhandled compound assignment operator")::llvm::llvm_unreachable_internal("Unhandled compound assignment operator" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4532); |
| 4533 | } |
| 4534 | |
| 4535 | struct GEPOffsetAndOverflow { |
| 4536 | // The total (signed) byte offset for the GEP. |
| 4537 | llvm::Value *TotalOffset; |
| 4538 | // The offset overflow flag - true if the total offset overflows. |
| 4539 | llvm::Value *OffsetOverflows; |
| 4540 | }; |
| 4541 | |
| 4542 | /// Evaluate given GEPVal, which is either an inbounds GEP, or a constant, |
| 4543 | /// and compute the total offset it applies from it's base pointer BasePtr. |
| 4544 | /// Returns offset in bytes and a boolean flag whether an overflow happened |
| 4545 | /// during evaluation. |
| 4546 | static GEPOffsetAndOverflow EmitGEPOffsetInBytes(Value *BasePtr, Value *GEPVal, |
| 4547 | llvm::LLVMContext &VMContext, |
| 4548 | CodeGenModule &CGM, |
| 4549 | CGBuilderTy Builder) { |
| 4550 | const auto &DL = CGM.getDataLayout(); |
| 4551 | |
| 4552 | // The total (signed) byte offset for the GEP. |
| 4553 | llvm::Value *TotalOffset = nullptr; |
| 4554 | |
| 4555 | // Was the GEP already reduced to a constant? |
| 4556 | if (isa<llvm::Constant>(GEPVal)) { |
| 4557 | // Compute the offset by casting both pointers to integers and subtracting: |
| 4558 | // GEPVal = BasePtr + ptr(Offset) <--> Offset = int(GEPVal) - int(BasePtr) |
| 4559 | Value *BasePtr_int = |
| 4560 | Builder.CreatePtrToInt(BasePtr, DL.getIntPtrType(BasePtr->getType())); |
| 4561 | Value *GEPVal_int = |
| 4562 | Builder.CreatePtrToInt(GEPVal, DL.getIntPtrType(GEPVal->getType())); |
| 4563 | TotalOffset = Builder.CreateSub(GEPVal_int, BasePtr_int); |
| 4564 | return {TotalOffset, /*OffsetOverflows=*/Builder.getFalse()}; |
| 4565 | } |
| 4566 | |
| 4567 | auto *GEP = cast<llvm::GEPOperator>(GEPVal); |
| 4568 | assert(GEP->getPointerOperand() == BasePtr &&((GEP->getPointerOperand() == BasePtr && "BasePtr must be the the base of the GEP." ) ? static_cast<void> (0) : __assert_fail ("GEP->getPointerOperand() == BasePtr && \"BasePtr must be the the base of the GEP.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4569, __PRETTY_FUNCTION__)) |
| 4569 | "BasePtr must be the the base of the GEP.")((GEP->getPointerOperand() == BasePtr && "BasePtr must be the the base of the GEP." ) ? static_cast<void> (0) : __assert_fail ("GEP->getPointerOperand() == BasePtr && \"BasePtr must be the the base of the GEP.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4569, __PRETTY_FUNCTION__)); |
| 4570 | assert(GEP->isInBounds() && "Expected inbounds GEP")((GEP->isInBounds() && "Expected inbounds GEP") ? static_cast <void> (0) : __assert_fail ("GEP->isInBounds() && \"Expected inbounds GEP\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4570, __PRETTY_FUNCTION__)); |
| 4571 | |
| 4572 | auto *IntPtrTy = DL.getIntPtrType(GEP->getPointerOperandType()); |
| 4573 | |
| 4574 | // Grab references to the signed add/mul overflow intrinsics for intptr_t. |
| 4575 | auto *Zero = llvm::ConstantInt::getNullValue(IntPtrTy); |
| 4576 | auto *SAddIntrinsic = |
| 4577 | CGM.getIntrinsic(llvm::Intrinsic::sadd_with_overflow, IntPtrTy); |
| 4578 | auto *SMulIntrinsic = |
| 4579 | CGM.getIntrinsic(llvm::Intrinsic::smul_with_overflow, IntPtrTy); |
| 4580 | |
| 4581 | // The offset overflow flag - true if the total offset overflows. |
| 4582 | llvm::Value *OffsetOverflows = Builder.getFalse(); |
| 4583 | |
| 4584 | /// Return the result of the given binary operation. |
| 4585 | auto eval = [&](BinaryOperator::Opcode Opcode, llvm::Value *LHS, |
| 4586 | llvm::Value *RHS) -> llvm::Value * { |
| 4587 | assert((Opcode == BO_Add || Opcode == BO_Mul) && "Can't eval binop")(((Opcode == BO_Add || Opcode == BO_Mul) && "Can't eval binop" ) ? static_cast<void> (0) : __assert_fail ("(Opcode == BO_Add || Opcode == BO_Mul) && \"Can't eval binop\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4587, __PRETTY_FUNCTION__)); |
| 4588 | |
| 4589 | // If the operands are constants, return a constant result. |
| 4590 | if (auto *LHSCI = dyn_cast<llvm::ConstantInt>(LHS)) { |
| 4591 | if (auto *RHSCI = dyn_cast<llvm::ConstantInt>(RHS)) { |
| 4592 | llvm::APInt N; |
| 4593 | bool HasOverflow = mayHaveIntegerOverflow(LHSCI, RHSCI, Opcode, |
| 4594 | /*Signed=*/true, N); |
| 4595 | if (HasOverflow) |
| 4596 | OffsetOverflows = Builder.getTrue(); |
| 4597 | return llvm::ConstantInt::get(VMContext, N); |
| 4598 | } |
| 4599 | } |
| 4600 | |
| 4601 | // Otherwise, compute the result with checked arithmetic. |
| 4602 | auto *ResultAndOverflow = Builder.CreateCall( |
| 4603 | (Opcode == BO_Add) ? SAddIntrinsic : SMulIntrinsic, {LHS, RHS}); |
| 4604 | OffsetOverflows = Builder.CreateOr( |
| 4605 | Builder.CreateExtractValue(ResultAndOverflow, 1), OffsetOverflows); |
| 4606 | return Builder.CreateExtractValue(ResultAndOverflow, 0); |
| 4607 | }; |
| 4608 | |
| 4609 | // Determine the total byte offset by looking at each GEP operand. |
| 4610 | for (auto GTI = llvm::gep_type_begin(GEP), GTE = llvm::gep_type_end(GEP); |
| 4611 | GTI != GTE; ++GTI) { |
| 4612 | llvm::Value *LocalOffset; |
| 4613 | auto *Index = GTI.getOperand(); |
| 4614 | // Compute the local offset contributed by this indexing step: |
| 4615 | if (auto *STy = GTI.getStructTypeOrNull()) { |
| 4616 | // For struct indexing, the local offset is the byte position of the |
| 4617 | // specified field. |
| 4618 | unsigned FieldNo = cast<llvm::ConstantInt>(Index)->getZExtValue(); |
| 4619 | LocalOffset = llvm::ConstantInt::get( |
| 4620 | IntPtrTy, DL.getStructLayout(STy)->getElementOffset(FieldNo)); |
| 4621 | } else { |
| 4622 | // Otherwise this is array-like indexing. The local offset is the index |
| 4623 | // multiplied by the element size. |
| 4624 | auto *ElementSize = llvm::ConstantInt::get( |
| 4625 | IntPtrTy, DL.getTypeAllocSize(GTI.getIndexedType())); |
| 4626 | auto *IndexS = Builder.CreateIntCast(Index, IntPtrTy, /*isSigned=*/true); |
| 4627 | LocalOffset = eval(BO_Mul, ElementSize, IndexS); |
| 4628 | } |
| 4629 | |
| 4630 | // If this is the first offset, set it as the total offset. Otherwise, add |
| 4631 | // the local offset into the running total. |
| 4632 | if (!TotalOffset || TotalOffset == Zero) |
| 4633 | TotalOffset = LocalOffset; |
| 4634 | else |
| 4635 | TotalOffset = eval(BO_Add, TotalOffset, LocalOffset); |
| 4636 | } |
| 4637 | |
| 4638 | return {TotalOffset, OffsetOverflows}; |
| 4639 | } |
| 4640 | |
| 4641 | Value * |
| 4642 | CodeGenFunction::EmitCheckedInBoundsGEP(Value *Ptr, ArrayRef<Value *> IdxList, |
| 4643 | bool SignedIndices, bool IsSubtraction, |
| 4644 | SourceLocation Loc, const Twine &Name) { |
| 4645 | Value *GEPVal = Builder.CreateInBoundsGEP(Ptr, IdxList, Name); |
| 4646 | |
| 4647 | // If the pointer overflow sanitizer isn't enabled, do nothing. |
| 4648 | if (!SanOpts.has(SanitizerKind::PointerOverflow)) |
| 4649 | return GEPVal; |
| 4650 | |
| 4651 | llvm::Type *PtrTy = Ptr->getType(); |
| 4652 | |
| 4653 | // Perform nullptr-and-offset check unless the nullptr is defined. |
| 4654 | bool PerformNullCheck = !NullPointerIsDefined( |
| 4655 | Builder.GetInsertBlock()->getParent(), PtrTy->getPointerAddressSpace()); |
| 4656 | // Check for overflows unless the GEP got constant-folded, |
| 4657 | // and only in the default address space |
| 4658 | bool PerformOverflowCheck = |
| 4659 | !isa<llvm::Constant>(GEPVal) && PtrTy->getPointerAddressSpace() == 0; |
| 4660 | |
| 4661 | if (!(PerformNullCheck || PerformOverflowCheck)) |
| 4662 | return GEPVal; |
| 4663 | |
| 4664 | const auto &DL = CGM.getDataLayout(); |
| 4665 | |
| 4666 | SanitizerScope SanScope(this); |
| 4667 | llvm::Type *IntPtrTy = DL.getIntPtrType(PtrTy); |
| 4668 | |
| 4669 | GEPOffsetAndOverflow EvaluatedGEP = |
| 4670 | EmitGEPOffsetInBytes(Ptr, GEPVal, getLLVMContext(), CGM, Builder); |
| 4671 | |
| 4672 | assert((!isa<llvm::Constant>(EvaluatedGEP.TotalOffset) ||(((!isa<llvm::Constant>(EvaluatedGEP.TotalOffset) || EvaluatedGEP .OffsetOverflows == Builder.getFalse()) && "If the offset got constant-folded, we don't expect that there was an " "overflow.") ? static_cast<void> (0) : __assert_fail ( "(!isa<llvm::Constant>(EvaluatedGEP.TotalOffset) || EvaluatedGEP.OffsetOverflows == Builder.getFalse()) && \"If the offset got constant-folded, we don't expect that there was an \" \"overflow.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4675, __PRETTY_FUNCTION__)) |
| 4673 | EvaluatedGEP.OffsetOverflows == Builder.getFalse()) &&(((!isa<llvm::Constant>(EvaluatedGEP.TotalOffset) || EvaluatedGEP .OffsetOverflows == Builder.getFalse()) && "If the offset got constant-folded, we don't expect that there was an " "overflow.") ? static_cast<void> (0) : __assert_fail ( "(!isa<llvm::Constant>(EvaluatedGEP.TotalOffset) || EvaluatedGEP.OffsetOverflows == Builder.getFalse()) && \"If the offset got constant-folded, we don't expect that there was an \" \"overflow.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4675, __PRETTY_FUNCTION__)) |
| 4674 | "If the offset got constant-folded, we don't expect that there was an "(((!isa<llvm::Constant>(EvaluatedGEP.TotalOffset) || EvaluatedGEP .OffsetOverflows == Builder.getFalse()) && "If the offset got constant-folded, we don't expect that there was an " "overflow.") ? static_cast<void> (0) : __assert_fail ( "(!isa<llvm::Constant>(EvaluatedGEP.TotalOffset) || EvaluatedGEP.OffsetOverflows == Builder.getFalse()) && \"If the offset got constant-folded, we don't expect that there was an \" \"overflow.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4675, __PRETTY_FUNCTION__)) |
| 4675 | "overflow.")(((!isa<llvm::Constant>(EvaluatedGEP.TotalOffset) || EvaluatedGEP .OffsetOverflows == Builder.getFalse()) && "If the offset got constant-folded, we don't expect that there was an " "overflow.") ? static_cast<void> (0) : __assert_fail ( "(!isa<llvm::Constant>(EvaluatedGEP.TotalOffset) || EvaluatedGEP.OffsetOverflows == Builder.getFalse()) && \"If the offset got constant-folded, we don't expect that there was an \" \"overflow.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4675, __PRETTY_FUNCTION__)); |
| 4676 | |
| 4677 | auto *Zero = llvm::ConstantInt::getNullValue(IntPtrTy); |
| 4678 | |
| 4679 | // Common case: if the total offset is zero, and we are using C++ semantics, |
| 4680 | // where nullptr+0 is defined, don't emit a check. |
| 4681 | if (EvaluatedGEP.TotalOffset == Zero && CGM.getLangOpts().CPlusPlus) |
| 4682 | return GEPVal; |
| 4683 | |
| 4684 | // Now that we've computed the total offset, add it to the base pointer (with |
| 4685 | // wrapping semantics). |
| 4686 | auto *IntPtr = Builder.CreatePtrToInt(Ptr, IntPtrTy); |
| 4687 | auto *ComputedGEP = Builder.CreateAdd(IntPtr, EvaluatedGEP.TotalOffset); |
| 4688 | |
| 4689 | llvm::SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks; |
| 4690 | |
| 4691 | if (PerformNullCheck) { |
| 4692 | // In C++, if the base pointer evaluates to a null pointer value, |
| 4693 | // the only valid pointer this inbounds GEP can produce is also |
| 4694 | // a null pointer, so the offset must also evaluate to zero. |
| 4695 | // Likewise, if we have non-zero base pointer, we can not get null pointer |
| 4696 | // as a result, so the offset can not be -intptr_t(BasePtr). |
| 4697 | // In other words, both pointers are either null, or both are non-null, |
| 4698 | // or the behaviour is undefined. |
| 4699 | // |
| 4700 | // C, however, is more strict in this regard, and gives more |
| 4701 | // optimization opportunities: in C, additionally, nullptr+0 is undefined. |
| 4702 | // So both the input to the 'gep inbounds' AND the output must not be null. |
| 4703 | auto *BaseIsNotNullptr = Builder.CreateIsNotNull(Ptr); |
| 4704 | auto *ResultIsNotNullptr = Builder.CreateIsNotNull(ComputedGEP); |
| 4705 | auto *Valid = |
| 4706 | CGM.getLangOpts().CPlusPlus |
| 4707 | ? Builder.CreateICmpEQ(BaseIsNotNullptr, ResultIsNotNullptr) |
| 4708 | : Builder.CreateAnd(BaseIsNotNullptr, ResultIsNotNullptr); |
| 4709 | Checks.emplace_back(Valid, SanitizerKind::PointerOverflow); |
| 4710 | } |
| 4711 | |
| 4712 | if (PerformOverflowCheck) { |
| 4713 | // The GEP is valid if: |
| 4714 | // 1) The total offset doesn't overflow, and |
| 4715 | // 2) The sign of the difference between the computed address and the base |
| 4716 | // pointer matches the sign of the total offset. |
| 4717 | llvm::Value *ValidGEP; |
| 4718 | auto *NoOffsetOverflow = Builder.CreateNot(EvaluatedGEP.OffsetOverflows); |
| 4719 | if (SignedIndices) { |
| 4720 | // GEP is computed as `unsigned base + signed offset`, therefore: |
| 4721 | // * If offset was positive, then the computed pointer can not be |
| 4722 | // [unsigned] less than the base pointer, unless it overflowed. |
| 4723 | // * If offset was negative, then the computed pointer can not be |
| 4724 | // [unsigned] greater than the bas pointere, unless it overflowed. |
| 4725 | auto *PosOrZeroValid = Builder.CreateICmpUGE(ComputedGEP, IntPtr); |
| 4726 | auto *PosOrZeroOffset = |
| 4727 | Builder.CreateICmpSGE(EvaluatedGEP.TotalOffset, Zero); |
| 4728 | llvm::Value *NegValid = Builder.CreateICmpULT(ComputedGEP, IntPtr); |
| 4729 | ValidGEP = |
| 4730 | Builder.CreateSelect(PosOrZeroOffset, PosOrZeroValid, NegValid); |
| 4731 | } else if (!IsSubtraction) { |
| 4732 | // GEP is computed as `unsigned base + unsigned offset`, therefore the |
| 4733 | // computed pointer can not be [unsigned] less than base pointer, |
| 4734 | // unless there was an overflow. |
| 4735 | // Equivalent to `@llvm.uadd.with.overflow(%base, %offset)`. |
| 4736 | ValidGEP = Builder.CreateICmpUGE(ComputedGEP, IntPtr); |
| 4737 | } else { |
| 4738 | // GEP is computed as `unsigned base - unsigned offset`, therefore the |
| 4739 | // computed pointer can not be [unsigned] greater than base pointer, |
| 4740 | // unless there was an overflow. |
| 4741 | // Equivalent to `@llvm.usub.with.overflow(%base, sub(0, %offset))`. |
| 4742 | ValidGEP = Builder.CreateICmpULE(ComputedGEP, IntPtr); |
| 4743 | } |
| 4744 | ValidGEP = Builder.CreateAnd(ValidGEP, NoOffsetOverflow); |
| 4745 | Checks.emplace_back(ValidGEP, SanitizerKind::PointerOverflow); |
| 4746 | } |
| 4747 | |
| 4748 | assert(!Checks.empty() && "Should have produced some checks.")((!Checks.empty() && "Should have produced some checks." ) ? static_cast<void> (0) : __assert_fail ("!Checks.empty() && \"Should have produced some checks.\"" , "/build/llvm-toolchain-snapshot-10~svn374645/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4748, __PRETTY_FUNCTION__)); |
| 4749 | |
| 4750 | llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(Loc)}; |
| 4751 | // Pass the computed GEP to the runtime to avoid emitting poisoned arguments. |
| 4752 | llvm::Value *DynamicArgs[] = {IntPtr, ComputedGEP}; |
| 4753 | EmitCheck(Checks, SanitizerHandler::PointerOverflow, StaticArgs, DynamicArgs); |
| 4754 | |
| 4755 | return GEPVal; |
| 4756 | } |